9x+9y=100 10x+10y=132如上,

y+10x=x+y+9 10y+x=y+10x+27 已知y/x=9/10则(1-y/x)[x/(y-x)]? x+(9-8-y)=10 y+y-(9-8-y)=2 x-y=xx-9.9x xy=11y-1 y=? x=? x+y-xy=?x+(9-8-y)=10y+y-(9-8-y)=2x-y=xx-9.9xxy=11y-1 y=?x=?x+y-xy=? x+10y+9=10x+y怎么解 x+4y=9,x-4y=10 {10x+9y=493 x+y=52 X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y) y+10x=x+y+9 10y+x=y+10x+27怎么做?六年级方程组！ 谁会解10x+y=6(x+y)+3 10y+x=4(x+y)+9 解方程组：{x(x+y+z)=6 {y(x+y+z)=9 {z(x+y+z)=10 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 解方程组 2x+y(y-2x)=9 (x+y)(x+y-3)=10十万火急!求解! 已知x>0,y>0 x+y+9/x+1/y=10,则x+y则最大值为? 已知正实数x,y满足x+y+1/x+9/y=10,则x+y的最大值是 100x+10x+y=9(10x+y) 化简 x+y=9① 6(10x+y)=100x+y ② 解二元一次方程 全过程、快 x²-2x+y²+6y+10=0,求—9(x+y)²+(3x-2y)(2y+3x)的值