已知x、y、z满足2x+3y+z=48 x-2y+2z=56 3x+5y+3z=52 则x+y+z的值为多少 急

题目

已知x、y、z满足2x+3y+z=48 x-2y+2z=56 3x+5y+3z=52 则x+y+z的值为多少 急

答案

2x+3y+z=48 ①
x-2y+2z=56 ②
3x+5y+3z=52 ③
①+②+③得6x+6y+6z=156
所以x+y+z=26