ab≠0,(a+1)/a+(1+b)/b=ab/(a+b+1)求a+b的和
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ab≠0,(a+1)/a+(1+b)/b=ab/(a+b+1)求a+b的和
ab≠0,(a+1)/a+(1+b)/b=ab/(a+b+1)求a+b的和
ab≠0,(a+1)/a+(1+b)/b=ab/(a+b+1)求a+b的和
你好象打反了 a/(1+a)+b/(1+b)=(a+b)/(1+a+b),a/(1+a)+b/(b+1)=a/(1+a+b)+b/(1+a+b) a/(1+a)-a/(1+a+b)=b/(1+a+b)-b/(1+b) a(1+a+b-1-a)/(1+a)(1+a+b)=b(1+b-1-a-b)/(1+a+b)(1+b) ab/(1+a)=-ab/(1+b) ab不等于0 1+a=-(1+b) a+b=-2