5X+10y=42 10x+5y=30解方程,要详细谢谢

(x+y)/6+(x-y)/10=1,(x+y)/6-(x-y)/10=5 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 解分式方程：10/(x+y)+3/(x-y)=-5,15/(x+y)-2/(x-y)=-1 3/(X-Y)+10/(X+Y)=-5 2/(X-Y)-15/(X+Y)=1 解分式方程组 ｛x/60+y/80=10,x/60+y/40=15、｛2x/3+3y/4=1/5,5x/6-5y/2=2、｛5/2(x+y）=1200,10/3（x+y）=1200｛4x+5y=98,5y-4x=2、｛x/3+y/4=54/60,y/4+x/5=42/60怎么解?{40-y=x-4 40-y=y-x (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian X^2-Y^2+6X+10Y-30=0 X^2+Y^2-5X-8Y+21=0 X=?Y=? 解方程组：（0.2x+0.1y）/2- （4x-y）/10=（x-y）/5+ (3x+0.5y)/30 (3x+2y-1)/8=3-(0.8x-5y)/41=-= x+y=5!x-y=-10 x=?,y=?x+y=5!x-y=-10x=?,y=? {2X=5(X+Y)3X-10(X+Y)=2怎么解? {6/x+y+10/x-y=30 6/x+y-10/x-y=-1 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x (7x-10y)-(-10y-5x)=? 10y+x/10x+y=5/6 x+5y=4,2x+10y=?