若3x+7y+9z=8且x+3y+4z=2,求x+y+z的值.

来源：学生作业帮编辑：神马作文网作业帮分类：综合作业时间：2024/11/11 20:01:11

(3X+7Y+9Z)-2(X+3Y+4Z)=X+Y+Z 8-2*2=4 因为(3X+7Y+9Z)-2(X+3Y+4Z) =(3X+7Y+9Z)-(2X+6Y+8Z) =(3X-2X)+(7Y-6Y)+(9Z-8Z) =X+Y+Z 所以 (3X+7Y+9Z)-2(X+3Y+4Z)=X+Y+Z 即 X+Y+Z=(3X+7Y+9Z)-2(X+3Y+4Z)=8-2*2=4

若3x+7y+9z=8且x+3y+4z=2,求x+y+z的值. 若x:y:z=3:4:5且x+y+z=24,求x、y、z的值若X:y:Z=3:4:5,且X+Y+Z=24,求X、Y、Z的值已知x:y:z=2:3:4,且x-y+z=36,求x+y+z的值. 已知x:y:z=2:3:4,且x+y+z=18,求x,y,z的值已知x/2=y/3=z/4,且x+y+z不等于0,求2x+3y-4z/x+y+z的值若2分之x+y=3分之y+z=5分之x+z 且x+y+z=18 求x,y,z的值已知x+y/2=y+z/3=z+x/4,且x+2y+z=12,求x-2y+z的值如果x+4/3=y+z/2=z+8/4,且x+y+z=12,求x,y,z的值. 已知4x-3y-6z=0,x+2y-7z=0,且x、y、z都不为0,求(3x+2y+z)/(x+2y+3z)的值快帮求已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值已知4x-3y-6z=0,x+2y-7z=0,且x,y,z≠0,求2x+3y+6z/x+5y+5z的值.