{6x=5y.300+4x+100=4y.方程组
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{6x=5y.300+4x+100=4y.方程组
{6x=5y.300+4x+100=4y.方程组
{6x=5y.300+4x+100=4y.方程组
300+4x+100=4y
400+4x=4y
100+x=y
x=y-100
6(y-100)=5y
6y-600=5y
y=600
x=600-100=500