(1) b/(a-b) + a/(a+b)-2ab/(b^2-a^2)(2) [1-1/(1-X) ] ÷X/X-1

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(1) b/(a-b) + a/(a+b)-2ab/(b^2-a^2)(2) [1-1/(1-X) ] ÷X/X-1

(1) b/(a-b) + a/(a+b)-2ab/(b^2-a^2)(2) [1-1/(1-X) ] ÷X/X-1
(1) b/(a-b) + a/(a+b)-2ab/(b^2-a^2)
(2) [1-1/(1-X) ] ÷X/X-1

(1) b/(a-b) + a/(a+b)-2ab/(b^2-a^2)(2) [1-1/(1-X) ] ÷X/X-1
(1) b/(a-b) + a/(a+b)-2ab/(b^2-a^2)
=(a+b)b/(a^2-b^2)+(a-b)a/(a^2-b^2)+2ab/(a^2-b^2)
=(ab+b^2+a^2-ab+2ab)/(a^2-b^2)
=(a^2+2ab+b^2)/(a^2-b^2)
=(a+b)^2/(a+b)(a-b)
=(a+b)/(a-b)
(2) [1-1/(1-X) ] ÷X/X-1
=(1-x-1)/(1-x)*(x-1)/x
=(-x)/(1-x)*(x-1)/x
=x/(x-1)*(x-1)/x
=1

1, (a+b)/(a-b)
2, 1

求解吗？第一题（a+b)^2/(a^2-b^2)
第二题1/(X-1)

1 原式=(a+b)b/a^2-b^2+(a-b)a/a^2-b^2+2ab/a^2-b^2
=a^2+2ab+b^2/(a+b)(a-b)
=(a+b)/(a-b)
2 原式=1-1/(1-x)-1
=1/(1-x) [X不等于0或1]

(a+b).(a-b) a/b-b/a a+b>a-b, a/a²-b-1/a+b a-b>a,a+b 计算a+b/b-a-b/b a+b a-b----- -- ------a-b a+b -------------------------1------a^2 -b^2 -2a(a+b)+b(a+b) 化简|a|+|-b|-|a-b|-|a+b| 化简 |b|-|a|+|a-b|+|a+b| [(a+b)(a-b)-(a-b) (a+b)(a-b)-a-b因式分解 化简 |a-b|+|a+b|-|a-b| 因式分解 a(a+b)-b(a-b) a(a+b)-b(a-b) (a-b+ab-a^2/a+b)乘以[a+1/a-b乘以(1+a/b)] b/a(b+1) a/b(b+1) (a+b)(a²-ab+b²)-b(b-1)