Question

[phung anh nguyet]

B1:tim cac so nguyenx,y biet:

X,y + 2.x- 3y= 11

B2 tim x biet

A -15.(x+2)+7.(2x-3)=(-5) . (+10)

Giai gap minh nhe

Answer 1

[💥Hoàng Thị Diệu Thùy 💦]

\(-15.\left(\chi+2\right)+7.\left(2\chi-3\right)=\left(-5\right).10\)

\(\Rightarrow-15\chi+\left(-30\right)+14\chi-21=-50\)

\(\Rightarrow\left(-15\chi+14\chi\right)=-50+30+21\)

\(\Rightarrow\chi=1\)

HTDT