发布网友 发布时间:2022-05-09 22:49
共4个回答
热心网友 时间:2023-10-26 16:34
第二个等式变为y=x-3代人一式得,x²-3x+2=0。原式=3(x+y)-y²+9-(3x²-xy)=3(x+y)-y²+7-3x²=3(2x-3)-(x-3)²+7-3x²=-4(x²-3x+2)-3=-3热心网友 时间:2023-10-26 16:34
(x+y)(x-y)-y²+(x-y)²-(6x²y-2xy²)÷(2y)热心网友 时间:2023-10-26 16:35
(x+y)(x-y)-y²+(x-y)²-(6x²y-2xy²)÷(2y)热心网友 时间:2023-10-26 16:36
(x+y)(x-y)-y2+(x-y)2-(6x2y-2xy2)÷(2y)