若a²+ab=2,ab+b²=-1,则a²+2ab+b²的值是
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若a²+ab=2,ab+b²=-1,则a²+2ab+b²的值是
若a²+ab=2,ab+b²=-1,则a²+2ab+b²的值是
若a²+ab=2,ab+b²=-1,则a²+2ab+b²的值是
若a²+ab=2,ab+b²=-1,则a²+2ab+b²=a²+ab+ab+b²=2-1=1