题目内容
若|a-2|+(b+3)2=0,求3a2b-[2ab2-2(ab-
a2b)+ab]+3ab2的值.
| 3 |
| 2 |
∵|a-2|+(b+3)2=0,
∴a=2,b=-3,
3a2b-[2ab2-2(ab-
a2b)+ab]+3ab2
=3a2b-2ab2+2(ab-
a2b)-ab+3ab2
=3a2b-2ab2+2ab-3a2b-ab+3ab2
=ab2+ab,
当a=2,b=-3时,原式=2×(-3)2+2×(-3)=18-6=12.
∴a=2,b=-3,
3a2b-[2ab2-2(ab-
| 3 |
| 2 |
=3a2b-2ab2+2(ab-
| 3 |
| 2 |
=3a2b-2ab2+2ab-3a2b-ab+3ab2
=ab2+ab,
当a=2,b=-3时,原式=2×(-3)2+2×(-3)=18-6=12.
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