已知m-2n=4,那么n-m/2=?,(m-2n)的平方+5-2n+m=?

题目

已知m-2n=4,那么n-m/2=?,(m-2n)的平方+5-2n+m=?

答案

∵m-2n=4
∴2n-m= -4
n - m/2 = -2
(m-2n)²+5-2n+m
= (m-2n)²+5+(m-2n)
= 4² + 5 + 4
= 25