方程组{x+y+z=50,1500x+2100y+2500z方程组是{x+y+z=50,1500x+2100y+2500z=90000
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方程组{x+y+z=50,1500x+2100y+2500z方程组是{x+y+z=50,1500x+2100y+2500z=90000
方程组{x+y+z=50,1500x+2100y+2500z
方程组是{x+y+z=50,1500x+2100y+2500z=90000
方程组{x+y+z=50,1500x+2100y+2500z方程组是{x+y+z=50,1500x+2100y+2500z=90000
X=50-y-z再把x=50-y-z代入1500x+2100y+2500z
方程组{x+y+z=50,1500x+2100y+2500z方程组是{x+y+z=50,1500x+2100y+2500z=90000
三元一次方程组 1500x+2100y+2500z=90000 x+y+z=50
方程组:{x+y-z=6,x+z=16,x-y+2z=17
解方程组{x+2z=50;x+y+z=70;2z+y=50
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