x(y+2)+(4-x)=9与x(y+3)+y(8-x)=14解方程式

3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 x(y+2)+(4-x)=9与x(y+3)+y(8-x)=14解方程式 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 若／X+Y-9／+（2X-Y+3)=0求X与Y的值 9y=3x-(x-1),4(x+y)-(2x+4)=8y   如果x=5分之2y,x与y【 】比例；如果x乘y=9分之4,x与y【 】比例；如果x-y=2  如果x=5分之2y,x与y【 】比例；如果x乘y=9分之4,x与y【 】比例；如果x-y=20,x与y【 】比例. 根据3（x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y= ,x-y= 通分:x-y/2x+2y与xy/(x+y)^2 ,2mn/4m^2-9与2m-3/2m+3格式：例如：x-y/2x+2y与xy/(x+y)^2最简公分母是.x-y/2x+2y=.xy/（x+y）^2=. 关于X,Y的方程组3X+2Y=2m+5与x-y=4m-5的解x,y满足x+2y 81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2 2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 （x+y）/2- x-y/2=6 3(x+y)=4(x-y)