-2a²-2a²+3a²b+a²,其中a等于根号2,b等于-1先化简,再求值
人气:499 ℃ 时间:2020-07-26 14:43:57
解答
-2a²-2a²+3a²b+a²
=-3a²+3a²b
=-3(a²-b)
=-3(2+1)
=-9
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