(a-b)²-(a-b)²等于多少是(a+b)²-(a-b)²
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(a-b)²-(a-b)²等于多少是(a+b)²-(a-b)²
(a-b)²-(a-b)²等于多少
是(a+b)²-(a-b)²
(a-b)²-(a-b)²等于多少是(a+b)²-(a-b)²
(a-b)²-(a-b)²=0
(a+b)²-(a-b)²
=a²+2ab+b²-a²+2ab-b²
=4ab
(a+b)²-(a-b)² =4ab
(a+b)²-(a-b)²
=a²+2ab+b²-a²+2ab-b²
=4ab