Cho hàm số \(y = f\left( x \right)\) có bảng biến...
Câu hỏi: Cho hàm số \(y = f\left( x \right)\) có bảng biến thiên như hình vẽ. Hỏi hàm số có bao nhiêu điểm cực trị?![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAaAAAABzCAYAAAGp7Ob6AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAXmUlEQVR4nO3dT0wb6f0/8Pf89D04Fd06IgcjpIqQP5hLZa/EyrTLyhtQRSqkOlKUmAs4UpsCJxIOpSdIL7QU5LSHkGxSJelKNWwrEQlaV6vV2l1QjfZgo16g7RZHbePxoZVRbdVIPTy/QzQudoyZ8Twzz8z485KiYLDn+Xie55nnmWeeeUZijDE4yP9r9Mfh4WGz4qhLlmVV75uamsLU1BQAQHJ0DpVKpaY2sry8zCUYHtut+kJtbW1NJRyPx5v63HHb29tctuvsImc1m5ubmj/DJYckSYJVMlpXDj179gwAuH+Z+fn5qtd37txR/2F2zO9//3umVjabrft7r9erehv1LCws6Po8Tn/Lm9bX13UlepJyuax7G7Y8yu3s7CAQCNT924l1SJIkyLKMjz76SFfiZ8+erfz8zjvvVH5WujW7u7uatxkIBKo+J0lS5YhoyxxqxNLtUDOcm0NDQ0NVf9je3sbi4qLpATXr4OAAgJNzyCkqXyiTyYiMgxsqclbH5QupHcwwg64vdObMGQBAR0cHl2AUmk4XalTqUKlUanpMwUoqOcTzyySTSW7bOq63t/f0N2k51/D5fKrfu7e3p/q9Ho9HSxgNnfiFALCNjQ1uCfGm5AUAlsvl2NraGmPMpid4jTiuHXJcDtWy0hBbM+qWODVj9gcHB5UrGFZmVObw7hwp+3JxcRGSJFV+7/gaZHeWOWaXSiXDrpppUe8iVa3l5eWmrwxqRTXI4ixTg0h9lEEWRxlkcXUz6PiVMKPs7++f+p6HDx8aGgNvV69e5b/ReuMOT548MWQ8w+12N/W5QqHAORJ1tAxu1Xr69CmXGJqanaAF753Lc+SuHt4zL/R+f8MySO+8FjVOmpPDGGN9fX11f5/L5TRvi5dmjiBcMygej/PcnGrRaLSpz+k5hOmRyWRUv5dOVC1OVQbZfUTYzhx9HqRmXM3qLJVBx2c48vCPf/yjauieJ6OmDq2urla9fiODzp07h3v37jXciCRJhn1xnkZHR7G1tSU6DNUkScJnn31W/Ttqg6zNUoc43uxS0xs5MYPMnu9mhYt1apkaa+2J0cbGBvvtb39b9bs6b+NqaWmJFYtF7tsFYEjsxWKRLS0tcd9uPW9En06n33yTwRnEGGODg4Pct2lUBhkR60kc3UlQ2h87xq5wdCfBCSiDLM4SGZTJZHDhwgXRYViSJTLI7/cjFAqJDkOT8fFxU9KxRCdhfHwcv/jFL7in4YROgiUyyChOyCBhh7j333//xL/xvslNr8PDw4a3WzWzpoBaJ97dYOTc41u3bmFnZ+fEv8uyjBcvXhiWvlbnz59vuG6Wz+cD8Dojuat39lp7K9oJb2tKKBTS9H4965CAw0hCIpHQ9P6uri5d6dV6I/obN268+SYThnoaCQQCTX1OTwbpmS4Vi8Wa/mwtVdHrzSAeU7Dm5uY0f6bZDNK7lJKCxypEhmcQry/bjGYyqNkpXCdptvYrDM0go6bsRiIRVe/j0QbxMD093fRnDckgoxYuO05NZ6NeBtW7nDI8PMwtLt40ZxAANjY2duIU2mYnyDer0SFETQZNTEwYEtdJ6qXXaJ9yrUFalq/gpVFDbJVDXC0tHR5HT/2loR5iOMogi+N6iLPrqDchzVJ1hFteXsby8jJmZmZMW2BDtM3NTZw7d050GA0py/vYYckkhSRJll6yVOu+VFWBZmZm8Pnnn2N5eVn1SoYHBweVmdGSJOFnP/sZAODixYuaAjRDqVSqinV8fBwjIyPo7u4WHVpD7733HgDg448/FhyJerlcTnQImpy2/DV14U6QyWTw9ttvY2NjAyMjI6LDcYxz587hX//6l2PKCVUgQnRoapTHrAmVpDFlHNjuNxDa2akVSDk/AICbN28CAJ4/f25sVIJsbm5WZgMavRCbXfBaZcKp+/bUCtTW1oaNjQ3k83msra2ZEZMwnZ2dKBaLKBaL6Ozs1LWt44MS1ELw3bfA/xYWF71/Tz0Hun37NkKhEL71rW+dvjE6BzKVsr9pv4tDgwg2RhVIPJoqQogOVIGIaW7fvg1ZlltrEKEVOSmDreSDDz5APp/Hn/70J9GhcPN/ogOwmpmZGVutJ2gnTrh/oRYNItgYDSKIR104QnRouQq0uroKSZKQz+eb+nx/f78xa/A4RH9/v+4Lm1ZbPKsR1V04WZaRz+fh8XhO/IJW7kqcPXsWhUIBACrfQ4+joyP4/X7s7e3xCK8pVunC5fN5jI6OIpFIcN1uMpnEzs4OZmdnuW6XKy1389+9e7fh3zVuznDT09MslUoZns7Kyoopa6nUUva3qP3Oe6G1RgKBgLBnfzbiuEGEfD6Pa9euIZVKCUm/o6PDtKeQiGiBnj17BpfLhXA4bEp6tY6OjtDf32+Zu1odU4HOnz+Pvb09uFwuIenXyufzuHXrFuLxuGFpmFWBrNBdref+/fvwer0N1441mq0r0LNnzwAAkUjEtDSbMTk5ie9973uVhYB5MboC9ff3Ix6Pw+12c982b8fPcU3Fsz/IeXN1lctlU/vevOl9LPzly5crP0PFOVA6na67nuRJUqkUm52dbT5AwbLZrOZFvvUwvQItLS2xWCzG2tvbWbFYfGO19JMEAgEmy7LeEC0jlUpVVpXVstRiX19f5Wc1FSiXy6mqQHorthWFw+HKcp9aB3nUllMhFaivr49tbGyw9vb2hu89XsicKhKJMADM5/Opej/PChSJRISsJ2umbDbLvF4vA6CpEqktp7Y+B2p1VrkO1Mq4zkSgTCStpuWm8hDCE1UgQnRw9PMzCDEatUCE6EAVyMYkScLq6qroMFqaqgokSRJKpRKGhoaMjscyrP4YjsXFRTDG8Le//U10KKrZ4ZExWqmqQMViEclkEp988knTCS0uLlYeeQLA8kdOqz+G44MPPgAAfP3rXxcciXp2eGSMQpmgqjyO56QJq6orkNaVVGqXtr1+/Tq6u7uxtbUFAJY6cg4NDVlimVgtrPicJSe5cuUKAOCb3/xm1etap67Ks7m5ic7OTnz++eeaAqgd3FtcXMT3v/99S14519OyivLgwQMAwMDAgKX2pVNcv35d1UwPGsY+gdMeBGUFTnxoGVUgQnSgYWxCdKAKRIgOmisQLXtLyP9orkBOWhi8lvLsV3oGLH9O3benVqChoSFsbm4ik8mgVCpVLuBZydTUFJftvHr1qup/wu+Ct1P37akV6JNPPsGvfvUrXLp0CW1tbWbERIhtqOrCvXr1ytLzwnj597//XfV/s5QpS8q/g4MDHuHZGq99qzi+f0WuC6fq+UB///vfMTAwYHQswn366aeQJAnFYlHXdrq7u+kCbA1e+1Zhlf3b8EKqsqC83+83MyZCbINmIhCiA11IJUQHqkCE6EAViBAdqAIRogNVIGIKWZZRKpVw4cIF0aFwRRXomJmZGciy7Lj5WlbQ0dGBtrY2vPvuu6JD4UrVhdRWQTPNjfeb3/xGdAhcUQtUI5PJ4Pnz56LDcCzlqYJOQRWImGJzc9M2Kx5pQTMRjlEyuLu7G3/9618FR0PsgM6BjqFjCdGKunCE6EAViBAdWqoC7e7u4gc/+AHOnDmDfD6v6bPz8/PY2dkxKDJnSCaTGB0dbXqwoLe3l3NEJlD92GKHcLlczOVyNfVZWZZZKBTiHJFzlMtlBkDXk9Wj0ShLJBL8gjKYqgo0NjbGBgcHGWOs8r/dlMtl5vV6WSqVYrIs69qWx+PhFJVzJBIJtrCwwILBoO5tFQoFLtsxg+oWqK+vjzHG2NrammHBGCUWi7GVlRXGGNNdeRQTExNsb2+Py7bsLhgMVvZrJpPhtl07HKhUV6DBwUGWTqeNjMUQPp+PFQoFQ7a9t7fHJiYmDNm2XbjdbkO3Pzs7y1KplKFp6KG6Ao2NjRkZhyHMOoLZ4UjJWyqV0nWuo0U2m2XhcNiUtLQ6tQKl02mWTqdZsVg0Ix4u4vE4m5ubMzXNUCjEstmsqWmKEg6HhXxXKx6oHDcKd7w/brZUKsVmZ2eFpG0W0YU4EolY6tzTUXPhzp49i0KhIDoMdHR0QJZl0WFwtb+/jx//+Md4+vSp6FCwu7uL58+fIxqNig7FGRdSd3Z2MDk5aYnKA7y++7K/vx+Hh4eiQ+FicnISR0dHlqg8AODz+RCNRnH27FnRodj/Qmo4HLZUk37c+vo6i0ajosPQRXSX7TQiu+yM2bwLZ5UuWyNHR0fw+/3Y29sTHYom+Xwet27dQjweFx3KqZLJJJLJJObn501P25YVaH9/H/fu3UMsFhMdimq9vb3IZDJwuVyiQznV/Pw8gsEggsGg6FA0EXHuabsKdOfOHdy8eROBQEB0KJo9fPgQbrcb4XC4qc8rT8jQslZ5T0+Ppoei2X0AxO/3I5FIwO12m5KerW6os0OXrZGJiQkcHh7C7/c39bgYj8ejeRb5V77yFVXvOzw8xNWrV21deYDXB5nV1VUcHh5iYmLC8PRMHYXb3NwEAHzjG99AJpNRPQyZz+fx/vvv27ryKNxuNzKZDDo6OkSHUnH//n0kk0mkUinRoXARDocRiUQqt0ckk0lNn9dSTg2tQOPj41UPQvrPf/4DAPjvf/8Lv9+vqiszPz+P3d1dJBIJI0M1nSzLmJ+fRzKZFPr4mN7eXkxMTCAUCgmLwQgulwt7e3s4f/489vf38eLFixPfq6ucmj3sB4Cl02nW3t7OHj9+3PC9Ho+HlctlkyIzXyKRYG63m6nNhlwup3lCrzKLvpZye4fTRaNRBkD1PlaoLaeWHURo9jzBjpLJJPb3903psysePnxoanqira6uwuv1wufzcd2uZSsQIXbgiKk8hIhCFYgQHagCEaIDVSBCdKAKRIgOVIEI0cGyw9iSJNFi74QQ4mDUgyOEECIENUBEs0wmg56enpaZqWgESZJwcHAAALh48SK2t7cFR+RMVFatjWsDlMlkcPPmTXz00UdCb2tcXFyEJEm4ePFi1WtJkjA1NSUsLqfweDyqb3MlbxoeHkYsFkN3dzeA148tj0QiYoNyKCqr+tQ7Xh4cHFSOp9vb21WvtT4YjGsD5Pf74XK58KUvfUnY7cqrq6u4fv06GGP44osvMDU1hZcvX4K9XsIYDx48wOLiopDYCAGAL7744o3f0RPhiRWsrq5WNSYrKytvNC6//vWvK8dTALhw4ULlNWNM0/GVawP085//HN/5znfw4YcfIpPJ4C9/+QvPzavyzjvvYGlpCcDrM5+PP/64MtQBvN7BX/3qV02PixDF7du38dlnn1Ve/+EPf8Dk5KTAiAh5LRwOVzUmk5OTVa8B4NNPPwXw+kxoYGAAk5OTWF1drWxD+bsaNAuOaCbLMr797W/j0aNHQtcSsrPt7W0MDAwAAGKxWNPLbJLGqKxaGzVAhBBChKBZcIQQQoR446EMWmcxGMlKsRBCCNHv+MjWGw2QVYa9aAiOOFlt+abyTlqR4UNwpVIJQ0NDlScVEftQ8k6SJAwNDaFUKokOiZBTUbm1D8MboGKxiNu3b2NkZMTopAhHsizjypUr+MlPfgLGGD788ENcuXKF7ignlkbl1l64NUDLy8sYHx8H8LoHEo1GIcsyOjo6cOPGDV7JOJqVVmn45S9/ibfeeguXLl0CAHz5y1/GW2+9pWmOP3G+7e3tqntARKNyay/cGqCenh68evUKpVIJ6XQaIyMjlnp4uxVtb283vOv4+A20Zuvp6dH0e9I6pqamKmV0YGAAo6OjldfDw8NCY6Nyay/cGqDOzk60t7dja2sLb7/9dqUHQk727rvvNrzrWFkrTISRkRF0dnbi0aNHAIBHjx6hs7OThlIJHjx4UCmjW1tbiMVilde/+93vhMZG5dZeuN2ImslkUCwW8d577/HYHM0KIo5Gs+AI0XkGpCx1/uTJE/j9fm6NDyGEEOejpXgIEYDOgAihpXgIIYQI8sYZEC1/QwghxCi0FA8hgtEQHCE0BEcIcaBMJoNz585BkqTKDfLEeqgBIifa3Nys3GBIa2oRu8jn87h06RL++c9/Vs4qaS1Ka6IGiNS1tbWFYDBYucHw6tWrCIVC1AgRy/N4PGhra8P4+HjlmjbdiGpN1ACRugYGBtDW1lZ5/cc//hHT09NVvyPEyp4/fw7GGL72ta/RGbxFvTEJgZDjSqUS7t69ix/96Ee0th+xnVKphHg8Tp0ni6IbUcmJlpeX0dPTUxm+UMbRaThDP5oFRwg1QIQIQQ0QIXQNiBBCiCDUABFCCBGCGqAW8/LlS+TzeUPTuH//Pg4PDw1Ng7SmnZ0dU9LZ3d3FixcvTEmrlVED5FDz8/Po7e2tesKqJEn46U9/Co/HY2ja09PT2N3dRUdHB+7fv29oWsR5kskkRkdHcebMmaqye+bMGXR1dZkSg8/nQzAYxLVr19Df3294p61lMYuycGi2sbKywtxuN5uYmGAA2PT0tJA4ZmdnWVdXF8tkMkLSt6La8k3lvZosyywQCLBQKMS6urqYy+VisiwLiyeVSjGPx8Pm5uaExeBE3Et9Op1mly9fZul0mjHGWLFYZD/84Q9ZsVjUFhhVyKbs7e0xr9fLwuEwKxQKjDHGstmssMbnuGw2ywKBQFVsrYoaoPrm5uaYx+NhqVSq8rtQKCS08alVL0bSHO6lPpfLse7ubraxscEYY2xtbY3lcjntgVGFVK1cLrOJiQnW1dVlm0oRi8WYx+NhT58+FR2KENQA/Y9dzy6On6W1eoeqWdxLfbFYZIODg2xmZoatra01vZ1WrpBqra+vM7fbzaLRqOhQmlYul1kkEmE+n4/t7e2JDsc0rd4AFQoFFgqFWCAQsNTZTbPW19eZx+NhKysrokOxFUNK/ZMnTzQPudVqtQqpltLrCgaDjut1ZTIZ5vV62fT0NCuXy6LDMVSrNkDRaJR5PB62vr4uOhRDKKMRXq+3pTpUzeJS6jc2NhgANj8/r7vhUbRKhVRrbm6Oud1ulkgkRIdiCuVAFY/HRYdiiFZqgJSOxcTEhOM7Fscp12MjkUhLfW8taCkeC9vZ2cG1a9cQiUSwsLAgOhwhDg8PMTo6iqOjI8RiMcOnkJvF6UvxHB0dYXJyEjs7O1hfX4fX6xUdklAPHz7EvXv3EI1GEQ6HRYdjHUKbvwYsHJqhjo+NZ7NZ0eFYSiKRYG63my0sLIgORbfa8u2U8q5MLqFrIfVR/a5m2VLvlAqpljLkFIvFRIdiC9PT07aa9VfLSQ1QNptlPp+PZoNppMz+m52dFR2KMDQEJ9Du7i5GR0cRCASwsrICl8slOiTbefnyJa5du4auri48ffoUbrdbdEiqOGEI7s6dO1hdXcX6+joCgYDocGxtfn4ejx49QiwWQzAYFB2OeYQ2fw1YODRdlGnHXq+XVgbgLBaLMbfbbYvhn9rybZfyHo/HHTMMakXKLNfh4eGWOJu0bKm3S4VUSxkbt/M9O3ZRLpdZOBy29FRYOzVAsiyzYDDIgsGgI+7ZsQvl3iInHzMsW+qtXCHVUpaeaZXejBVlMhnW1dVl+hRg5daE9vb2yrJUx/FogE5LQ6+FhQXmdrsdOxXeLo7fW+S0URPLHuV5NUB3795lANh3v/tdJssyGxwcrFTax48fc0mj1uzsLPN4PC1zz45dRKNR5na7694EaUTjlMvlWF9fn2EN0GlpNCOVSrGurq6WuBnYjo6v9VibP2acnfI+njq6Aapdh25sbIwtLS1VXudyOV3LBR2XSCRsuZ5VKyoUCiwYDFYtAxMMBlXdna8sNQWg7r+xsbHKe5ttgHiloZYyNbjVlkOyO2W1e2XmbDweZz6fz7D0jDieOroB2tjYqLTKS0tL7PLly+zGjRvsz3/+M2OMscePH1cWTW1GoVBgw8PDjlnPqhUp9xa5XC4GgOsSMVY/A1IOYK26IKxTKB0IpQwb1QgZcTx1dANklEZDOcQeUqkUm5ubY8PDw6yrq6vqDINHvqbTadbe3l7ZZm3F5NEAnZZGPfUe10HsqVwus4WFBRaJRFggEKgqw0aeCfFE9wERIoAT7gMiRC/LPpKbKiMhhDibZRsgQgghzkYNECGEECGoASKEECIENUCEEEKEoAaIEEKIEP8fpb2J0Ll7T6AAAAAASUVORK5CYII=)
A Có ba điểm.
B Có hai điểm.
C Có một điểm.
D Có bốn điểm.
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi HK2 môn Toán lớp 12 THPT chuyên Nguyễn Huệ Hà Nội - Năm 2018 - 2019 (có lời giải chi tiết)