题目内容
[(x-y)2+(x+y)2](x2-2y2)
x2-4y2
-|-|2
-+
2(x-y)3·(x-y)4-(x-y)5·(y-x)2
(2x+3)2(2x-3)2-(1-4x)2(-1-4x)2
[(-2a3b4)2·(0.5a3b2c)]3÷[(-4a3)·(-a3b2)3]
计算(5a-4b)(-5a-4b).
-()2×3-4÷(-)×+8×(-1)2
(+5.2)+(-0.6)++(-3.2)