1.1/a-1/b=1(b-a)/(ab)=1a-b=-ab(2a+3ab-2b)/(a-2ab-b)=[2(a-b)+3ab]/(a-b-2ab)=(-2ab+3ab)/(-ab-2ab)=ab/(-3ab)=-1/32.1/a+1/b=5/(a+b)(a+b)/(ab)=5/(a+b)(a+b)²=5aba/b+b/a=(a²+b²)/(ab)=[(a+b)&su...