题目内容
(1)计算:
(2)化简求值:5(3a2b﹣ab2)﹣(ab2+3a2b),其中
.
(2)化简求值:5(3a2b﹣ab2)﹣(ab2+3a2b),其中
解:(1)
=﹣
(﹣9×
﹣8)
=
×(﹣12)
=8;
(2)5(3a2b﹣ab2)﹣(ab2+3a2b)
=15a2b﹣5ab2﹣ab2﹣3a2b
=12a2b﹣6ab2
当
原式=12×
×
×
﹣6×
=1﹣
=
.
=﹣
=
=8;
(2)5(3a2b﹣ab2)﹣(ab2+3a2b)
=15a2b﹣5ab2﹣ab2﹣3a2b
=12a2b﹣6ab2
当
原式=12×
=1﹣
=
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