搜搜考试网(a+b)/(a-b)+(a+b)/(a-b)(a-b)-(a+b)/(aa-bb)
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(a+b)/(a-b)+(a+b)/(a-b)(a-b)-(a+b)/(aa-bb)
(a+b)/(a-b)+(a+b)/(a-b)(a-b)-(a+b)/(aa-bb)
=(a+b)/(a-b)+(a+b)/(a-b)(a-b)-(a+b)/(a+b)(a-b)
=(a+b)/(a-b)+(a+b)²/(a-b)²(a+b)-(a+b)(a-b)/(a+b)(a-b)²
=(a+b)/(a-b)+(2ab+2b²)/(a+b)(a-b)²
=(a+b)/(a-b)+2b(a+b)/(a+b)(a-b)²
=(a+b)(a-b)/(a-b)²+2b/(a-b)²
=(a²-b²+2b)/(a-b)²
=(a+b)/(a-b)+(a+b)/(a-b)(a-b)-(a+b)/(a+b)(a-b)
=(a+b)/(a-b)+(a+b)²/(a-b)²(a+b)-(a+b)(a-b)/(a+b)(a-b)²
=(a+b)/(a-b)+(2ab+2b²)/(a+b)(a-b)²
=(a+b)/(a-b)+2b(a+b)/(a+b)(a-b)²
=(a+b)(a-b)/(a-b)²+2b/(a-b)²
=(a²-b²+2b)/(a-b)²
(aa-bb)(aa-bb)/(a-b)(a-b)
(a+b)/(a-b)+(a+b)/(a-b)(a-b)-(a+b)/(aa-bb)
计算(a+b)(aa-ab+bb)-(a+b)(a+b)
a.aa=b.bb.a-b=?
a/b=2,求(aa-ab+bb)/(aa+bb)
(a+b)(aa-ab+bb)=?
a+b=2,那么aa-bb+4b=?
若aa+bb=25,a+b=7,且a>b,则a-b=?
[aa+bb-1/(aa)--1/(bb)]/[aabb-1/(aa)1/(bb)]+[(a-1/a)(b-1/b)]/
已知a+b=2求(aa-bb)(aa-bb)-8(aa+bb)的值
已知（a+b)(a+b)=8,(a-b)(a-b)=2,求（1）aa+bb; (2)aaabbb
求证： aa/(b+c-a)+bb/(c+a-b)+cc/(a+b-c)≥bc/a+ca/b+ab/c