x+y=100 18x+10y=1500咋解?快速

X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y) x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 328-y/y x 100％=-18％ 化简 x / y(x+y) - y / x(x+y) = x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 100x+10y+1z=18x+18y+18x 求：x、y、z各是几. x+y=100 18x+10y=1500咋解?快速 x+y=100 18x+10y=1500咋解?快速 x+y=100 2×16x=18y {x-y=100 {12%x-10%y=100 x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=? x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=? 10X+Y+1/3Z=10Y+X 10X+Y+2/3Z=100X+Y 解方程组：2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66 解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66 y=x(x x+y=20,x-y=10,y= y+10x=x+y+9 10y+x=y+10x+27