计算1-a-b/a+2b除以a^2-b^2/a^2+4ab+4b^2

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计算1-a-b/a+2b除以a^2-b^2/a^2+4ab+4b^2
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计算1-a-b/a+2b除以a^2-b^2/a^2+4ab+4b^2
计算1-a-b/a+2b除以a^2-b^2/a^2+4ab+4b^2

计算1-a-b/a+2b除以a^2-b^2/a^2+4ab+4b^2
1-(a-b)/(a+2b)除以(a^2-b^2)/(a^2+4ab+4b^2)
=1-(a-b)/(a+2b)×(a+2b)²/(a+b)(a-b)
=1-(a+2b)/(a+b)
=(a+b-a-2b)/(a+b)
=-b/(a+b)

=(2 x-2)(2-x 2)/(x-2) =x(4-x)/(x-2) (2)1-[(a-b)/(a 2b)]÷[(a 2;-b 2;)/(a 2; 4ab 4b 2;)] =1-[(a-b)

原式=[(a-b)/(a+2b)]×[(a+2b)^2/(a+b)(a-b)]-1
=(a+2b)/(a+b)-1
=(a+2b-a-b)/(a+b)
=b/(a+b)