4(a+b)^2-7(a+b^2)+(a+b^2),其中a=1/2,b=-1/3
人气：295 ℃ 时间：2020-08-02 19:49:53
解答
解4(a+b)²-7(a+b²)+(a+b²)=4(a+b)²-7a-7b²+a+b²=4(a+b)²-6a-6b²=4a²+8ab+4b²-6a-6b²=4a²+8ab-6a-2b²=4×1/4+8×1/2×(-1/3)-6×1/2-6×(-1/3)...
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