如果m+n=-5,mn=6,则（m-n）的2次方的值是?要过程!
人气：496 ℃ 时间：2020-01-26 01:41:16
解答
m + n = -5
mn = 6
(m + n)^2 = 25
mn = 6
(m - n)^2
= (m + n)^2 - 4mn
= 25 - 24
= 1
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