Question

2x+3y+9z+5p=60 x+y+z+p=11 2x+2y+2z+4p=42 5x+7y+11z+9p=97 计算出

Answer 1

由x+y+z+p=11 2x+2y+2z+4p=42 得

p=10

所以2x+3y+9z=10

x+y+z=1

5x+7y+11z=7

消去x得

y+7z=8

2y+6z=2

解得

z=7/4

y=-17/4

所以

x=7/2