9x+4y+z=10,-9x+2y+3z=-6,3x-4y+2z=5怎么解

X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z 三元一次方程组,1.x-2y+z=9 2x+y+3z=10 3x+2y1.x-2y+z=92x+y+3z=103x+2y-z2.3x-5y+2z=14x+5y-z=5X-5y+3z=-23.7x+2y-z=76x-y+z=74x+3y+z=94.4x+3y-2z=-75x-6y+z=12x+z=-25.2x+3y-4z=-23x-2y+5z=262x+5z=31 x+y=5 2x+3y-z=9 x-y+z=4 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. 三元一次方程x+y+z=0 4x+2y+z=3 9x+3y+z=6x+y+z=04x+2y+z=3 9x+3y+z=6 解方程 x+y+z=0 4x+2y+z=3 9x-3y+z=28解方程x+y+z=04x+2y+z=39x-3y+z=28 方程组3x+y+2z=10,2x+3y-z=9,x+y+z=6 2x+y-z=2 x-y+2z=2 3x+2y+4z=9 2x+y-z=2 x-y+2z=2 3x+2y+4z=9 {x+y+z=0 4x+2y+z=3 9x+3y+z=6 解方程组 x+y+z=5 2x-y-z=4 3x-2y-z=9 {x+y+z=0 {4x+2y+z=3 {9x+2y+z=6 2x+3y-z=9,x+y+z=15,5x-4y-z=0 x+y+z+2,4x+2y+z+2,9x+3y+z=6解方程组 正数x,y,z满足5x+4y+3z=10求证25x^2/(4y+3z)+16y^2/(3z+5x)+9z^2/(5x+4y)>=5 2x+z=10 x+y-z=4 3x-y-z=0 2x+3y+z=13 4x^2+9y^2+z^2-2x+15y+3z=82 求x,y,z 第1题 {x+2y+3z=4{y+z=1{3x+2z=3 第2题{x+y=7{y+z=10{z+x=9 第3题 {x+2y+z=10{2x+3y-z=2{3x+2y+2z=17