a²+ab=4,b²+ab=-1,a²+2ab+b²=
a²+ab=4,b²+ab=-1,a²+2ab+b²=
数学人气:275 ℃时间:2020-02-03 21:51:57
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a²+2ab+b²=a²+ab+ab+b²=4-1=3
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