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先化简,再求值:(2a+b)(2a-b)-b(a-b),其中a=1,b=-2.
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先化简再求值5a3﹣3b2+5a3﹣22ab﹣b2其中a=﹣1b=.
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先化简再求值ab2﹣a2b﹣22ab2﹣a2b其中a=﹣1b=﹣2.
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化简或求值33a2-2ab-24a2-ab
先化简再求值﹣3a2﹣2ab+[3a2﹣ab+2]其中a=﹣b=4.
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化简求值:3a2b-2[2ab2-2ab-3a2b+ab]+3ab2其中a=-1b=2
先化简再求值﹣2ab+3a﹣22a﹣b+2ab其中a=3b=1.
先化简再求值﹣a2b+3ab2﹣a2b﹣22ab2﹣a2b其中a=1b=﹣2.
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