二分之一x-y=三分之一x x-y-1=z 4x-5y+3z=5
人气:317 ℃ 时间:2019-10-24 09:12:27
解答
1/2*x-y=1/3*x
y=x5/6①
x-y-1=z②
4x-5y+3z=5③
①带入②得
x-5/6x-1=z
z=x/6-1④
①④带入③
4x-5*(5x/6)+3(x/6-1)=5
4x-25x/6+x/2-3=5
1/3x=8
x=24
y=20
z=3
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