1/2(a+b)(a+b)=ab+1/2c^2化简
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1/2(a+b)(a+b)=ab+1/2c^2化简1/2(a+b)(a+b)=ab+1/2c^2化简1/2(a+b)(a+b)=ab+1/2c^2化简1/2(a+b)(a+b)=ab+1/2c^21/
1/2(a+b)(a+b)=ab+1/2c^2化简
1/2(a+b)(a+b)=ab+1/2c^2化简
1/2(a+b)(a+b)=ab+1/2c^2化简
1/2(a+b)(a+b)=ab+1/2c^2
1/2（a²+b²+2ab）=ab+1/2c²
a²+b²+2ab=2ab+c²
a²+b²=c²