来自孙勇的问题
【2(a²+b²)(a+b)²-(a²-b²)²4(1+2x-3y)+(3y-2x)²(x+y)²-4(x+y-1)3(a-2)²-(3a-2)+27(2-3a)】
2(a²+b²)(a+b)²-(a²-b²)²
4(1+2x-3y)+(3y-2x)²
(x+y)²-4(x+y-1)
3(a-2)²-(3a-2)+27(2-3a)
1回答
2020-05-16 18:55