问题:
计算
(1)
1
2
xy 2-(-4x 3y)
(2)(-2ab) 2(3a 2-ab-4b 2)
(3)(x-y) 2-y(x+y)
(4)(2a+b-3)(2a+b+3)
计算
(1)
xy 2-(-4x 3y)
(2)(-2ab) 2(3a 2-ab-4b 2)
(3)(x-y) 2-y(x+y)
(4)(2a+b-3)(2a+b+3)
(1)
1 |
2 |
(2)(-2ab) 2(3a 2-ab-4b 2)
(3)(x-y) 2-y(x+y)
(4)(2a+b-3)(2a+b+3)
参考答案: