prep让我题目也看不懂

chicken0812

n = y+e

m = z+4

所以要先求出y, z, e:

x+4 = 1  x=-3

y+4 =-5  y=-9

x+e = 7  e=10

z+e =10  z= 0

由此可知，n=1, m=4  m+n =5