解二元一次方程组 (x-5)(y+2)=xy x-5=y+2 要过程!
2019-05-28
解二元一次方程组 (x-5)(y+2)=xy x-5=y+2 要过程!
优质解答
(x-5)(y+2)=xy
xy-5y+2x-10=xy
2x-5y=10 (1)
x-5=y+2
x-y=7 (2)
(2)×5-(1)
3x=25
x=25/3
y=x-7=4/3
(x-5)(y+2)=xy
xy-5y+2x-10=xy
2x-5y=10 (1)
x-5=y+2
x-y=7 (2)
(2)×5-(1)
3x=25
x=25/3
y=x-7=4/3