{2X=5(X+Y)3X-10(X+Y)=2怎么解?
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{2X=5(X+Y)3X-10(X+Y)=2怎么解?{2X=5(X+Y)3X-10(X+Y)=2怎么解?{2X=5(X+Y)3X-10(X+Y)=2怎么解?2x=2推出x=1,然后代入15(1+y)-
{2X=5(X+Y)3X-10(X+Y)=2怎么解?
{2X=5(X+Y)3X-10(X+Y)=2怎么解?
{2X=5(X+Y)3X-10(X+Y)=2怎么解?
2x=2推出x=1,然后代入15(1+y)-10(1+y)=2推出y= -- 3/5
2x=5(x+y),3x-10(x+y)=2
所以:3x+5y=0,7x+10y=-2
解得:x=-2,y=6/5
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