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a=二分之一m+1,b=二分之一m+2,c=二分之一m+3,求a^2+2ab+b^2-2ac+c^2-2bc
人气:462 ℃ 时间:2019-12-06 14:38:09
解答
a+b-c
=1/2m+1+1/2m+2-1/2m-3
=1/2m
a^2+2ab+b^2-2ac+c^2-2bc
=(a+b)^2-2(a+b)c+c^2
=(a+b-c)^2
=(1/2m)^2
=(1/4)m^2
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