试题:
规定一种新运算,a*b=a+b,a#b=a-b,其中,a、b为有理数,化简a2b*3ab +5a2b#4ab结果为 [ ] |
A.6a2b+ab B.-4a2b+7ab C.4a2b-7ab D.6a2b-ab |
整式的加减
2016-05-17
答案:
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