已知a²-ab=6,ab-b²=2,求a²-2ab+b²,a²-b²的值
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已知a²-ab=6,ab-b²=2,求a²-2ab+b²,a²-b²的值
已知a²-ab=6,ab-b²=2,求a²-2ab+b²,a²-b²的值
已知a²-ab=6,ab-b²=2,求a²-2ab+b²,a²-b²的值
a²-ab=6,ab-b²=2
a²-2ab+b²
=a²-ab-ab+b²
=a²-ab-(ab-b²)
=6-2
=4
a²-b²
=a²-ab+ab-b²
=6+2
=8