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认真计算(1)(-4ab)³(3/4a²b)³(2)1/2ab²×(2a&sup

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/11/08 12:19:56
认真计算
(1)(-4ab)³(3/4a²b)³
(2)1/2ab²×(2a²b-3ab²)
(3)(x+y)²-(x-y)²
(4)(-m²)(-m²)³
(1)(-4ab)³(3/4a²b)³
=(-64a³b³)(27/64a^6b³)
=-27a^(3+6)b^(3+3)
=-27a^9b^6
(2)1/2ab²×(2a²b-3ab²)
=a³b³-3/2a²b^4
(3)(x+y)²-(x-y)²
=(x+y+x-y)(x+y-x+y)
=(2x)(2y)
=4xy
(4)(-m²)(-m²)³
=(-m²)^4
=m^8