(2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/b]

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(2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/b]
(2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/b]

(2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/b]
原式=2/3a-[2/(a+b)]{[(a+b)/3a]-(a+b)}÷[(a-b)/b]
乘进去
=2/3a-[2/3a-2]×[b/(a-b)]
=2/3a-(2-6a)/3a×[b/(a-b)]
=2/3a-(2b-6ab)/3a(a-b)
=(2a-2b-2b+6ab)/(3a^2-3ab)
=(2a-4b+6ab)/(3a^2-3ab)

[2/3a - 2/(a+b) * (a+b/3a - a - b)] / (a-b)/a
=[2/3a-2/(a+b)*(a+b)*(1/3a-1)]/(a-b)/a
=a[2/3a-2(1/3a-1)]/(a-b)
=a*2/(a-b)
=2a/(a-b)

5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b) (2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/a] 化简:[2/3a - 2/(a+b) * (a+b/3a - a - b)] / (a-b)/a (a+2b)(a-2b)+(a-b)(a+b)-2(a-3b)(a-b) (2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/b] 因式分解:2a(a-b)-a(2a+3b) 2a(a-b)+4a(2a+3b) (2a-3b)[(a+b)-b(a-3b)] a^2(a-b)+b^2(b-a) 因式分解 (a-b)^3-(a-b)^2 因式分解 A-B A+B 2B+A 3A-B 6A+2B a^3-ab^2 =a （a^2 -b^2) =a(a+b)(a-b) 2(a+3b)²-8(a+b)(a-b)-(a+3b)(a-b) 化简a/b(a-b)-b/a(a-b)其中a=3 b=-2 2(a+b)-[4(a+b)-3(a+b)]一[5(a-b)+(a-b)]过程 -2a(a+b)+b(a+b) （（a+2b)+(2a+3b))*(a+b)/2 (3a+b)*(a-2b)*(2a+b) (3a+2b)*(2a+b)*(a+b)=