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(a+b)的方—(a+b)的方
人气:376 ℃ 时间:2020-10-22 18:14:13
解答
(AB-1)(A+B)^2+1 =(AB-1)A^2+(AB-1)B^2+2AB(AB-1)+1 =(AB-1)A^2+(AB-1)B^2+2(AB)^2-2AB+1 =(AB-1)A^2+(AB-1)B^2+(AB)^2+(AB)^2-2AB+1 =(AB-1)A^2+(AB-1)B^2+(AB)^2+(AB^2-2AB+1) =(AB-1)A^2+(AB-1)B^2+(AB)^2+(AB-1)...
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