Cho hàm số y = f(x) có đồ thị như hình vẽ. Số nghi...
Câu hỏi: Cho hàm số y = f(x) có đồ thị như hình vẽ. Số nghiệm của phương trình 2|f(x)| - 5 = 0 là![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKwAAACDCAYAAAAQy/A7AAAACXBIWXMAAA7EAAAOxAGVKw4bAAATXElEQVR4nO2deXBc1ZWHv9ebultqbbZasmTLslbLWrAWG8nGrDYmEwwhQFUgKTwhqZCEKigmpCozFMWkElJDmAkJExgTyJgJGSDCsccOMbExWPICtmx5iSVLtrWgfWnJalmb1VL3mz+MFRRtvbzXrZbu94/L7917zm3pp9t3PUeSZVlGIAgSNIFugEDgCUKwgqBiQQu2paWFgYGBQDdD4AELWrAff/wxDQ0NgW6GwAMWtGCPHTtGbW1toJsh8IAFK9ienh7q6uqorq4OdFMEHrBgBdvW1obD4aC7uxun0xno5gjcRBfoBgSKzMxMHnjgAfLy8tBoFuzfbdAxb39TjY2NlJWV4XQ6aW9v5/LlyxPe63Q6TCYToaGhSJIUoFYKPGVeCtbhcNDS0sKuXbvo6upi+/bttLe3TyrndDrFcCDImJeC1el0WK1WzGYz4eHh9Pf3k5aWFuhmCRRgXgpWo9HQ29tLfHw8J06cwGw2YzAYAt0sgQLMS8ECREREkJOTQ0lJCXl5eYFujkAh5q1gS0tL6e7uprCwkDvuuCPQzREoxLxd1nr44YdpamoiKysr0E0RKMi87WEtFosQ6zxk3gpWMD8RghUEFUKwgqBCCFYQVAjBCoIKIVhBUKGIYF24cCEOkQjURxHBllLCm/xYCVMCwYwoIthIrFTxKQ5GlDAnEEyLIoLNoACQaaZGCXMCwbQoIthQIoglkRpOKmFOIJgWxVYJ0sinhnKlzAkEU6KYYDNZSzv1XGVQKZMCwSQUE2wSWUhINIpxrEBFFBOskVBiWS6GBQJVUXSnK4NCIViBqigq2FUU0U0rQ1xR0qxAMI6igk1kJRq0NFClpFmBYBxFBasnhDiSqOJTJc0KBOMoflprFUXUckZpswIBoIJgMyikhzb66VXatECgvGCXko4OA3WcVdq0QKC8YHXoSSSD8xxX2rRAoM6Ng5WsEeNYgSqoItgM1mCnk1461TAvWMCoIth4UjASRq0YxwoURhXBatCQxCqq+EQN84IFjGq3ZldRTAOVapkXLFBUE2w6eVyhhy6a1HIhWICoJlgry7AQzSVOq+VCsABRMZCGRDI54lyBQFFUjfySRTGNnBdBNgSKoapg08hnmEFaEflcBcqgqmAjiWERcVSLWwgChVA9GFwaBVRzTG03UyLLMpcvX6atrS0g/gXKo7pgV3EjrdTh4KrariZht9t544032LZtm999C9RBdcGmkIsLF42cV9vVJKKiorjlllv87legHqoL1oSFWJZTFcBhwXTJj0NCNBiN8zbz07zELwGNV3EjNZzwh6tJaDSaKdPL2+09lJc3cOrURY/sddo6eP21v3B43wWlmijwAL90L6so4mPeZQA7YUT6wyVwrXe12+10d3fjcDjG883K8ijbtpUxOvo4ZWUt9PVtY8OGInJzVzM0NMSxY8cYGRkhKiqKoqIiXKMyZ/96lpqsjzgUspOmfA3OIxm8kvwMKWkr/PZ5BH7qYZeRgZ4Qvx/qHhoaoqenh8TERKqrq7/wxsXICJjNVpxOIx0dnfT3X4ul4HK56OnpwWazYbfbAdA4Jf5b8wwn9DsYeesu5H1PEbLlPH9Y9gwOhv36mRY6kizLsj8cvcoPCGcR3+Bf/OFuVtraWnjuuf8lJ2cZTzzx8IxlSylhN6/wE3ZwuVLL44//nq88mkLv1neRMPFPvIbE1ONkgbL4LSlHNuu4xClk/PL3MSvx8UtZvz6CjRtnTu9px8Z7/JKt/CthxJCYHc1Djxm5b9ONPMHrNHOBP/Gan1ot8JtgV7KWK/Rgo8VfLpnty2N0VMvVqzOfc9jFr1nBKlZz2/iz++/fSkRcFAaMfI//4H1ep50GRdosmBm/CdbKUsKJ5oLKUbrHxsY4cOAAP/3pTxkZ8S3nQhfNHOcDvsqTE56HhISg1WiBa3EYCtjIH/h3n3wJ3MOPebokUsmjkiOqe4qPj6e2tpaxsTGf7Ozjd6SQSzI5E57v2LGDlpa/fVPczxNc4hSfBWBzZKHh18RyudzMZ5xXNduMTqcjPT2dyMjIWYcEMzHEFU6yny/xzUnvGhsbGRoaGv//YhLI5Wb28obX/oKR/v5+zp8/T2dnJzU1NT53EO7g122eNPIYY5TPqCKdfJ9sVVRU0NDQML626nA4SE9PJzc3F4fD4ZNYAT7lz1iIJpv1k96ZzWa0Wu2EZ3fxj/ycR7HRSgwJPvkOBgYHBzl06BB2u52amhpiY2MJCwtj6dKlqvr1q2DNWEgghXMc9lmwCQkJhIWFjQvH6XQSFRUFXBtjAuNi9obD7ORm7pvy3UMPPURoaOiEZ8vJZCnplFLCgzzltd9gQa/Xc+edd7J3717S0tJ45JFHcLlcqvv1e67ZLNYpcj42Li6OjIwMUlNTSU1NJSMjA6vViizLlJWV0dnZyZEjR7zqaRuoxI6NIu6e8n1kZCR6vX7S81t4gJN8iJNRj30GG3a7nTNnznD06FHS0tKoqKjA4XCo7tfvgs1mPT20qRoVJjMzk5dffpmsrJnXWKfjMP9HCjcQTvSU7/fu3UtHR8ek53nczihXqQ7QuQl/cvXqVY4cOUJ+fj719fUYjcbxbzY18ftRpXhSCCOSaspZxxbF7UuSxJIlS9wqazLJmM0TfwSjjFDJER7mR9PWa2w8T25u5mR7hJLFeo6ym2zWedbwICMxMZGnnro29BkdHZ3yG0cN/N7DSkjksp6zlCli78qVy7zwwk5++9u/AO6Pobq7u9i718b+/RPD25/nGCEYWM2tU9Zra2vlo48GKS2dOiz+Jr5GPWdxof6Mea7w92K12WyqDQ90u3btUsXwdGjH9LTFDFJfXMGfDu7GOQiyxrvBul4/xu7drZw69XWgj+bm/2TNmiQcjuntSZKERnOVHTvsNDX9gLq6GoaGfkFOThrysJazt+/A0W7m/cq9jBpGJtSDAd5+24HN9s+8+moFvb0vk5ychMNxbbdMkjWM4cB+ex+/b3mVyKpknIb5P569jiRJOJ1OSkpKxpcXV69eTUFBgWKrBzp/jDsmetSQIRVSK31Eh7mOpaNZyFrvroFrtRpMJgMhIeB0OggJ0WMw6JnmvPY4kiSj12txOgfRap2YzUYMegNXpCs0GarZ5HoMrVGHZkLHISHLTgyGMQYGLhMS4sBkMmIwhKDVytdmyDKYXKGkuvI5ZyplY8gqnAa/f4kFjOuCNRqNGAwGQkNDMRgMyg4X5ADxkvx9eY/8is92hof75e9858fyz372X7IsO92u19d3Wd669Vn5N795d/xZpXxIfka+Z8Z6nZ0d8osv/lH+8MNPpi1zTj4i/0j+ktttmW/Y7XbVbAfszz+XDVRw0Gc7RmMYDz6Yz5Yta/FkSB4eHsWmTYncdNPfJk8f8R6ZFM1Yz2qN5emnv8rGjcW0t3fw/PPPs3PnzgllUsljlNEFe709IiJCNdsBE2w267Fjo4NGn21t3Hg32dmeb0QMDckMD1+bHA1gp5Fz3MZdbtePjIwgIiKC9vb2Cc+NmFlKOn/lsMdtEsxMwARrZRmRxFCpwC/V5XL5vBV7gSP0doVS+nYuFW4eKDOZTFit1knbtHDtG0SkMVWegM4IsljHGQWWt/bs2UN5uXfi0GjA5YDdnfspMhdReIOW48fhz392r77TOfWEMYti7HRho9mrdgmmJqCCLWAjLVziCpd9stPb28vAwIBXdUO0euptDi44K9kYdifpWfDNR+H0aRgcdM/GVL17LMuxEM0FTnnVLsHUBFSwy8nEjMXn0PIWiwWTyeRVXa3TSHvUCVbEG0hiNQAmExgMMDzL/cLu7m5qa2upr6+nsXHyWHwF2QEL0zRfCWgUCS06MljDKT6meJqDJu6wZcuWKWMPuIPLJdFk3o/rQiHyMgOY4dw5kCT4/PDXtFgsFp588kkkSZpyHJtFMbt5FRlZXFJUiICHPSngDrbzHCMMEYLZKxvebn5o0WGni884Q3L30/zuAGgt0NsLDz4IU2hwkt+ZfKeRxzCDtFFHAqletVEwkYALNp18JCQucJJcbvbKxv79+4mJiSEvL8+jegaMVFPOMDLfXV9I70qw9UByMugU+MlEEUsEi7jASSFYhQj4vqEBEyms5iQfem2jpaWFnp4ej+tpZC2nOEAKNwAmohZBeroyYr1OMrlcpEI5gwucgAsWYC13Uk05Y3h3wuf63rWnXA0ZoM1ykXxu98qvO6RTSAuX5kw8hmBnTgg2i3W4cHqdcebuu++msLDQ84op/SxOiCYdL+q664IchhkQ67EKMScEaySUFG6gnL94VT88PByz2cMJmwwj2R1kmQsxYfHKrzssIp4wIqjjr6r5WEjMCcECrGEz1ZR7dR/q0KFDVFVNfaB6Oly4aIk8zw3O22Yv7AMSEsvIEONYhZgzgs2mGAfDXiVUrq2tnXQAZTZapYu09zUT373SY3+eksJqmhHxZJVgzgjWhIVUVnMMNzfxv4BOp5ty4X4mznEIe9UIrg71D7Ank0Mf3QxgV93XfGfOCBZgHfdQySeMehgZZvPmzR6vwZ7jKBEXk5D9cPVqCUlo0dGMZ9G+BZOZU4LNYh0SGo/PFsTGxhIZ6X5k71Zq6cPGSkcRo5L62W0MmFhMAnVeDHcEE5lTgtVjIIt1HGWPR/UqKiqoq6tzvzwHWEIy8VIKo34KerGCHOrFSoHPzCnBAtzEPdRylgH63K5z9uxZGhrcj896moMUsgktOvDTgn4y2XTShHMBXf9Wgzkn2GRysRDJSfa7XUeSpGlTG/09LVzCTheruc2vye4SWclVBulBZGX0hTknWAmJIr7MIXbOXvhzbr31VrKzs90qW84HJJCKiXCvt4K9IZo4zITTSPXshQXTMucEC1DMFrppcfuXu2LFCmJjY2ctJyNzhjLWfn7R0J/7+xIa4lhOA5V+8zkfmZOCjcJKGnkcpMSt8lVVVTQ3z75X30g1/fSSh7q7W9ORTI6I0u0jc1KwALfzNc5wkGFmv6t1/PhxLlyYfSfpU/aQxCos00QlVJsksrlMh8jt5QNzVrCZ3IiZcD7hfbfKzzbpGmOU05SpEjHRXZaSyhijdPkxk858Y84KVoOWW3iAg7w761hz7dq1pKWlzVjmPJ/iZNTrWw1KYCEaC5Fi4uUDc1awABv4ClfooZKjM5bLzs4mMTFxxjKlvEcuGwjBu9u1ShFHEo14drJM8DfmtGDNhFPMFj5g+4zlGhsbsdls076300UtZ7iFB5VuosckkU0LlwLdjKBlTgsWYDOP0EQN9ZybtszBgwc5d27694fZSQwJJLFKjSZ6RBKZ9NLl102L+cScF2w0cRSyiV38etoyLpdr2gwmTsY4wm5u5yG1mugRS0j5fOLVFOimBCVzXrAA/8CjXOLUtIvu2dnZLF++fMp317K6OMc3CwJNONGEEUGTOGroFUEhWCuJFLOFd/n5lO9nWiXYx/9wE/eix8+RxmdATLy8JygEC3Afj9PMpSnjF3R2dmK3Tz7NX005NlrnzHDgOolkiomXlwSNYMNZxH18n3d4YVKu2n379nH69OQr4n/kV9zEvdPm23IXWZapr69nz549lJSUMDxblLhZWE4mPbR7fLNCEESCBdjENwhnEe/wwoTnY2Njk+K0HucDumjiy3zbZ78ul4uXXnqJoqIiDhw4wHvvveeTvXiScTGGjVaf27bQCCrBgsS3eZ7D7OTEF87LpqWnER8fP/7/Ifp5m3/jfp4gDPevzkyHVqvl2Wefpbe3l4iICNat8y1pXCRWTFhoFcMCjwl4MDhPSSCVrTzHNp4mmt+TQi4bbsrnix/lDZ4hgRSPNwq6u7upqqpCq9WOp/AJDQ2loKAAq9VKXV0dRqMRnQLBt6wso5Fq1rDZZ1sLiSDrYa+xgfu4h+/xKx5jd+07bL3vFN/9+mE6GjvZxS+p5TSPTbOiMBOyLE+4vXD9376+Pt58802Ki4sJCwvjxRdf9PkzLCNdTLy8IOh62Ovcy/ewyOG8Fv1jHN96hPYzS/nhwE9YPCzzI+N2wkcWs+3NbdjtdqxWK1u3bkWr1fLWW2/R2tqK1WpleHh4Qm8ZExNDTEzMJF9dXV1UVVVx8eJFOjo6uO0238/TLieLcvYh40IKzn4jIEiyr+lXAsz7lTt45bNfsCRTw+aUe7hjZCuLDbG4ZBcdHR2MjY2h1+uJi4tDkiQ6OzsZGRnBYDCwe/du1q5d61ZMg4GBAU6cOEFMTIzb13FmwkYLL/ItfshviUGZtJYLgaDtYa9z98oHSBzMx+LUs0JexvX9AY2kmTARu84Xr9JotVq30yWFhYUp0rNeJ5o49ITQRr0QrAcE/3eRDnJvTGZF+jI8TSOg0YwQEhKY3ANadCxmKU3ibKxHBH0P6y11dXUcPjyE3X6BlJR0jMZQv7chgVSaRJA4jwj+HtYLZPkq27efZtGiH3L2bA6lpccD0o7lZGIT12U8YkEKVpK0xMUZ6eqqBjpYvNj3zQVvWEYGNprpwbNQoQuZoF8l8Jbh4X4OHDhOfPxiCgpWB6QNIwxTxg7WcheRTF5OE0xmwQpWEJwsyCGBIHgRghUEFUKwgqBCCFYQVAjBCoIKIVhBUCEEKwgqhGAFQYUQrCCoEIIVBBX/D0+hbOPLLQvXAAAAAElFTkSuQmCC)
A. 3
B. 5
C. 4
D. 6
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG năm 2018-2019 môn Toán Trường THPT Chuyên KHTN - Hà Nội