Câu hỏi của Hoài Thương

Question

3x(2x X + 1) - 2x (10-2 x X) - ( 5x X + 2)= 10-X

Lê Hiền Nam · Accepted Answer

$3\cdot\left(2\cdot x+1\right)-2\cdot\left(10-2\cdot x\right)-\left(5\cdot x+2\right)=10-x$

$\Rightarrow6\cdot x+3-20+4\cdot x-5\cdot x+2=10-x$

$\Rightarrow6\cdot x+3-20+4\cdot x-5\cdot x+2+x=10$

$\Rightarrow\left(6\cdot x+4\cdot x-5\cdot x+x\right)+3-20+2=10$

$\Rightarrow6\cdot x=10-3+20+2$ $\Rightarrow6\cdot x=29$ $\Rightarrow x=\frac{29}{6}$

Câu trả lời:

$3\cdot\left(2\cdot x+1\right)-2\cdot\left(10-2\cdot x\right)-\left(5\cdot x+2\right)=10-x$

$\Rightarrow6\cdot x+3-20+4\cdot x-5\cdot x+2=10-x$

$\Rightarrow6\cdot x+3-20+4\cdot x-5\cdot x+2+x=10$

$\Rightarrow\left(6\cdot x+4\cdot x-5\cdot x+x\right)+3-20+2=10$

$\Rightarrow6\cdot x=10-3+20+2$ $\Rightarrow6\cdot x=29$ $\Rightarrow x=\frac{29}{6}$