解三元一次方程组:x/5=y/3 x/7=Z/3 2x-y-z=34

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解三元一次方程组:x/5=y/3 x/7=Z/3 2x-y-z=34
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解三元一次方程组:x/5=y/3 x/7=Z/3 2x-y-z=34
解三元一次方程组:x/5=y/3 x/7=Z/3 2x-y-z=34

解三元一次方程组:x/5=y/3 x/7=Z/3 2x-y-z=34
x=5y/3
z=3x/7=5y/7
10y/3-y-5y/7=34
34y/21=34
y=21
x=35
z=15

由x/5=y/3 得y=3x/5 (1)
由x/7=Z/3得z=3x/7 (2)
把(1)、(2)代入2x-y-z=34得
2x-3x/5-3x/7 =34 解得x=35代入(1)、(2)得y=21 z=15