Question

解二元二次方程组的一道题目二元二次方程组:(x-1)(y+2)=0(x+1)(y-2)=0怎么解..

Answer 1

(x-1)(y+2)=0

X-1=0或,Y+2=0

X=1或Y=-2

(x+1)(y-2)=0

X=1时,Y=2

Y=-2时,X=-1

即X=1,Y=2或

X=-1,Y=-2