计算:1、(-3分之1a³b²)²(-2ab²)³÷(-9分之1a的4次方b的4次方)²
问题描述:
计算:1、(-3分之1a³b²)²(-2ab²)³÷(-9分之1a的4次方b的4次方)²
计算:2、[(x+y)²-(x+y)(x-y)]÷2y
答
=1/9 a的6次方b的4次方 ×(-8a³b的6次方)÷(1/81a的8次方b的8次方)
=-72ab²
2、[(x+y)²-(x+y)(x-y)]÷2y
=(x+y)(x+y-x+y)÷2y
=2y(x+y)÷2y
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