10x+20y+30z＝41 12x+20y+28z＝42 14x+25y+40z＝54 10x+20y+30z＝4112x+20y+28z＝4214x+25y+40z＝54

10x+20y+30z＝41 12x+20y+28z＝42 14x+25y+40z＝54 10x+20y+30z＝4112x+20y+28z＝4214x+25y+40z＝54 X=3z X+y+z=12 X+2y-2z=10 ｛x＋y＝20 y－z＝30 z－x＝10 x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 解下列三元一次方程组：10x+20y+30z=41 12x+20y+28z=42 14x+25y+40z=5410x+20y+30z=4112x+20y+28z=4214x+25y+40z=54 3X+2y+z=20 x+y+z=10 Y=3X 请高手帮我解几道3元1次的方程组!好的100分,x+2y+3z=15x-y+7z=20x+3y+2z=14x+y-z=3y+z-x=5z+x-y=7x+y-z=0.5x-3y+2z=03x+2y-z=23x-2y=12y+3z=2x+5z=315x-3y+2z=13x+4y-z=-18z=136x-y-z=32x-4y+8z=53x-6y-z=10x+y=3y+z=5x+z=6 x+y-z=5,2x+3y+z=10,x-2y-z=20求方程组 x+y-z=5 2x+3y+z=10 x-2y-z=20 速解, 方程组 3X-Y+Z=10 X+2Y-Z=6 X+Y+Z=12 紧急..x+y+z=20x+2y+1.5z=367x+10y+6z=100 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 帮忙解这几道三元一次方程组(1)X-Y+Z=22X-3Y-Z=-7Z=3(2)X+Y+Z=6X-2Z=12X-2Y+Z=3(3)X+Y=8Y+Z=6Z+X=4(4)X-Y=3Y-Z=4X+Z=5(5)2X+3Y-Z=102X+Y-5Z=8-2X+7Y+Z=20(6)2X+Y+Z=3X+2Y+Z=4X+Y+2Z=5(7)X:Y=2:1X+Y+Z=23X+2Y-2Z=10第一天上课没听懂明天上课绝 求{x+y-z=5；2x+3y+z=10；x-2y-z=20中x、y、z的值, ﹛x+y+z＝12﹛x+2y-z＝6﹛3x-y+z＝10解三元一次方程 X＋Y＋Z＝12 X＋2Y﹣Z＝6 3X-Y+Z＝10解三元一次方程 解3元一次方程组：x+y+z=70 x/30+y/20+z/40=2/5 x/40+y/20+z/30=10/23 3X+4Y=10 4Y-2Z=20 5X+2Z=30 求X、Y、Z的值.