怎么证明a²+2ab+b²=(a+b)²
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怎么证明a²+2ab+b²=(a+b)²
怎么证明a²+2ab+b²=(a+b)²
怎么证明a²+2ab+b²=(a+b)²
右边=(a+b)²;
=(a+b)(a+b)
=a²+ab+ba+b²
=a²+2ab+b²=左边;
所以a²+2ab+b²=(a+b)²
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a²+2ab+b²
=a²+ab+ab+b²
=a(a+b)+b(a+b)
=(a+b)(a+b)
=(a+b)²