解方程组7y-x=4,2x+y=3.x+2y+3z=14,2x+y+z=7,3x+y+2z=11.
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解方程组7y-x=4,2x+y=3.x+2y+3z=14,2x+y+z=7,3x+y+2z=11.解方程组7y-x=4,2x+y=3.x+2y+3z=14,2x+y+z=7,3x+y+2z=11.解方
解方程组7y-x=4,2x+y=3.x+2y+3z=14,2x+y+z=7,3x+y+2z=11.
解方程组7y-x=4,2x+y=3.x+2y+3z=14,2x+y+z=7,3x+y+2z=11.
解方程组7y-x=4,2x+y=3.x+2y+3z=14,2x+y+z=7,3x+y+2z=11.
把上式命名为a式b式c式d式e式
2a+b 9y=11 得y=9/11 进而得x=12/11
c-2d z-3x=0
2e-c 5x+z=8
得x=1 z=3 再带入得y=2
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解方程组7y-x=4,2x+y=3.
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解方程组,x+y/2=3x-2y=10+6x+y/4,
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解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3
解方程组题目一道(x+y)(x-2y)=-5(x-y)(x+2y)=7