(1/(a-b)-1/(a+b)÷b/(a^2-2ab+b^2),化简

a(a-1)-(a×a-b)=-5,求(a×a+b×b)÷2-ab 化简 (a²+b²/a²-b²-a-b/a+b)÷2ab/(a-b)(a+b)& 计算：a/b(a-b)-b/a(a-b)；（1/a+1/b）÷a²+2ab+b²/a+b. （a-b)(a^2+ab+b) 化简 化简 b²-a²/a²-ab÷（a+(2ab+b²/a))·(1/a+1/b) 帮帮我忙： 9.化简1/(a+b)+1/(a-b)-(a-b)/(a^2+ab+b^2)-(a+b)/(a^2-ab+b 计算ab/(a+b-1)(a+b)+ab/(a+b)(a+b+1)+ab/(a+b+1)(a+b+2)+.+ab/(a+ 【4ab/(a-b)+(a/b-b/a)÷(1/a+1/b)】÷(a²+2ab+b²)化简 化简：{[(2a-b)/(a+b)]-[b/(a-b)]}÷[(a-2b)/(a+b)] 急……ab/(a+b-1)(a+b) + ab/(a+b)(a+b+1) + ab(a+b+1)(a+b+2) + …… 计算:[(a-b)(a+b)]^2-(a^2+ab+b^2)(a^2-ab+b^2)+(4a^2b^2)(b-1)(b+ A=B+B+B+B+B+B+B+B+B+B+B+B+B+B+B A-B×3=C C+2×7+2=1