(2a-5b)(2a-5b-4)-12和(m^2*n^2+1)-4m^2*n^2

songpeng772022-10-04 11:39:542条回答

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朋友的困扰 共回答了25个问题 | 采纳率96%
(2a-5b)(2a-5b-4)-12
=(2a-5b)^2-4(2a-5b)-12
=(2a-5b-6)(2a-5b+2)
(m^2*n^2+1)^2-4m^2*n^2
=(m^2*n^2+1-2m*n)(m^2*n^2+1+2m*n)
=(m*n-1)^2(m*n+1)^2
1年前
XIXI爱BOBO 共回答了2个问题 | 采纳率
(2a-5b)(2a-5b-4)-12
=(2a-5b)^2-4(2a-5b)-12
=(2a-5b-6)(2a-5b+2)
(m^2*n^2+1)^2-4m^2*n^2
=(m^2*n^2+1-2m*n)(m^2*n^2+1+2m*n)
=(m*n-1)^2(m*n+1)^2 就这样 孩子努力学习 以后少靠百度啊
1年前

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