解方程组{x+y+z=51}{4.5x+9y+7.5z=360}{4x+8y+5z=300
解方程组{X+Y+Z=51 4X+8Y+5Z=300 X+Y+2Z=61
解方程组x-y-3z=4 3x+y-z=6 -x+3y+z=8
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18
解x(x+y+z)=4-yz、y(x+y+z)=9-xz、z(x+y+z)=25-xy方程组
3x-y+2z=8 2x+2y-4z=9 7x+y-5z=-4解方程组
怎样解方程组x+y=8 y+z=6 z+x=4
解方程组:x:y:z=4:7:8,x+y+2z=54
x+y+z=51 4x+8y+5z=300 x+y+2z=67
解方程组 2x+y+z=7 x+2y+z=8 x+y+2x=9
方程组 2x+y+z=7,x+2y+z=8,x+y+2z=9 快
解方程组x+y-z=-5,x-y-z=1,x-y+z=15