Câu hỏi của Thùy Mai

Question

Rút gọn:

A=(-5x+4).(3x-2)+(-2x+3).(x-2)

B=(x-y+z)2+(z-y)2+2(x-y+z).(y-z)

Diệu Huyền · Accepted Answer

$B=\left(x-y+z\right)^2+\left(x-y\right)^2+2\left(x-y+z\right)\left(y-z\right)$

$B=\left(x-y+z\right)^2+2\left(x-y+z\right)\left(y-z\right)^2$

$B=\left(x-y+z+y-z\right)^2$

$B=x^2$Câu trả lời: $B=\left(x-y+z\right)^2+\left(x-y\right)^2+2\left(x-y+z\right)\left(y-z\right)$

$B=\left(x-y+z\right)^2+2\left(x-y+z\right)\left(y-z\right)^2$

$B=\left(x-y+z+y-z\right)^2$

$B=x^2$

Vũ Minh Tuấn · Answer

$A=\left(-5x+4\right).\left(3x-2\right)+\left(-2x+3\right).\left(x-2\right)$

$A=-15x^2+10x+12x-8-2x^2+4x+3x-6$

$A=\left(-15x^2-2x^2\right)+\left(10x+12x+4x+3x\right)+\left(-8-6\right)$

$A=-17x^2+29x-14.$

Chúc bạn học tốt!Câu trả lời: $A=\left(-5x+4\right).\left(3x-2\right)+\left(-2x+3\right).\left(x-2\right)$

$A=-15x^2+10x+12x-8-2x^2+4x+3x-6$

$A=\left(-15x^2-2x^2\right)+\left(10x+12x+4x+3x\right)+\left(-8-6\right)$

$A=-17x^2+29x-14.$

Chúc bạn học tốt!

Bài 3: Biểu đồ