10x+y=242 10y+x=341咋解?快速

10x+y=242 x+10y=340 x+y=20,x-y=10,y= y+10x=x+y+9 10y+x=y+10x+27 (x+y)/6+(x-y)/10=1,(x+y)/6-(x-y)/10=5 {6/x+y+10/x-y=30 6/x+y-10/x-y=-1 y+y+x=10,x+y+x=8,y=?,x=? 已知|x|+x+y=10 |y|+x-y=12 求 x+y=? 已知|x|+x+y=10,|y|+x-y=12,求x+y的值 已知|x|+x+y=10,x+|y|-y=12,求x、y的值 已知/x/+x+y=10,/y/+x-y=12.求x+y的值 (x+y)(x+y-10)+25=0,且x-y=3,求x,y (x+y)(x+y-10)+25=0,且x-y=3,求x,y X+Y-8X+10Y+41=O,求X/Y-Y/X的值 x,y 满足x(x-2)-y(y-6)=-10,求x,y的值 10x+y=143 10y+x=341 求x,y X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y) X,Y是有理数 X+|X|+Y=10 |Y|+X-Y=12 求X+Y=多少? 已知实数x,y满足|x|+x+y=10、x+|y|-y=12,则x+y的值?