(a-1/2b)[(a+1/2b)^2-(a=1/2b)^2](a^2+1/2ab+b^2)-2b(a^4-1)a=2,b=-1
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![(a-1/2b)[(a+1/2b)^2-(a=1/2b)^2](a^2+1/2ab+b^2)-2b(a^4-1)a=2,b=-1](/uploads/image/z/7200023-23-3.jpg?t=%EF%BC%88a-1%2F2b%EF%BC%89%5B%28a%2B1%2F2b%29%5E2-%28a%3D1%2F2b%29%5E2%5D%28a%5E2%2B1%2F2ab%2Bb%5E2%29-2b%28a%5E4-1%29a%3D2%2Cb%3D-1)
(a-1/2b)[(a+1/2b)^2-(a=1/2b)^2](a^2+1/2ab+b^2)-2b(a^4-1)a=2,b=-1
(a-1/2b)[(a+1/2b)^2-(a=1/2b)^2](a^2+1/2ab+b^2)-2b(a^4-1)
a=2,b=-1
(a-1/2b)[(a+1/2b)^2-(a=1/2b)^2](a^2+1/2ab+b^2)-2b(a^4-1)a=2,b=-1
式子抄错了吧.等号都出现了.