3X+7Y+Z=5,4X+8Y+2Z=3,则X+Y+Z的值为
1个回答
3X+7Y+Z = 5 ①
4X+8Y+2Z = 3 ②
由②-①,就可得 X+Y+Z = -2
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解方程组3x+y+2z=8,x+y+z=5,2x+3y+4z=7
已知x+7y+8z=3 3x-y+2z=5 求x+y+2z的值.