计算或化简: (1)(1/4a2b)•(-2ab2)2÷(-0.5a4b5) (2)(2x+y)2-(-2x+3y)(-2x-3y)
问题描述:
计算或化简:
(1)(
a2b)•(-2ab2)2÷(-0.5a4b5)1 4
(2)(2x+y)2-(-2x+3y)(-2x-3y)
答
(1)原式=(
a2b)•(4a2b4)÷(-0.5a4b5)=-2;1 4
(2)原式=4x2+4xy+y2-4x2+9y2=4xy+10y2.