计算:(1)(a+b²)(2a-b) (2)(2x-y)(x+y)-y(x-y)
1个回答
(1)(a+b²)(2a-b)
=4a²+2ab²-ab-b³
(2)(2x-y)(x+y)-y(x-y)
=2x²+3xy-y²-xy+y²
=2x²+2xy
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