Trắc nghiệm Phương trình bậc nhất hai ẩn có đáp án...

A. 5

B. 6

C. 7

D. 4

A. (−7; −14) 

B. (−1; −2)

C. (−3; −4)

D. (−5; −9)

A. m = 1

B. m = 2

C. m = 3

D. m = 4

A. $m=\frac{1}{3}$

B. $m=\frac{2}{3}$

C. $m\ne 2$

D. $m\ne \frac{1}{3}$

A. $\left\{\begin{array}{l}x=5-2t\\ y=-5-3t\end{array}\right.\left(t\in \mathbb{Z}\right)$

B. $\left\{\begin{array}{l}x=5+2t\\ y=5-3t\end{array}\right.\left(t\in \mathbb{Z}\right)$

C. $\left\{\begin{array}{l}x=5-2t\\ y=5+3t\end{array}\right.\left(t\in \mathbb{Z}\right)$

D. $\left\{\begin{array}{l}x=5+2t\\ y=5+3t\end{array}\right.\left(t\in \mathbb{Z}\right)$

A. 2

B. −2

C. 6

D. 4

A. 2

B. 3

C. 1

D. −1

A. m = 1

B. m = 2

C. m = 3

D. m = 4

A. m = 1

B. $m\ne \frac{1}{2}$

C. m = 2

D. $m=\frac{1}{2}$

A. $\left\{\begin{array}{l}x=3t-8\\ y=5t-16\end{array}\right.\left(t\in \mathbb{Z}\right)$

B. $\left\{\begin{array}{l}x=3t-8\\ y=-5t-6\end{array}\right.\left(t\in \mathbb{Z}\right)$

C. $\left\{\begin{array}{l}x=8t-3\\ y=15t-16\end{array}\right.\left(t\in \mathbb{Z}\right)$

D. $\left\{\begin{array}{l}x=3t+8\\ y=5t+6\end{array}\right.\left(t\in \mathbb{Z}\right)$