已知a≠b且a(a+2)=b(b+2),则a+b的值是

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解答:
因为:a(a+2)=b(b+2,所以:a^2+2a-b^2-2b=0,即:(a+b)(a-b)-2(a-b)=0
因为:a不等于b,所以:a+b-2=0
所以:a+b=2
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