[(900/(X+Y)+4]X=900;[900/(X+Y)+16]Y=900.解方程组Hurry up!

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[(900/(X+Y)+4]X=900;[900/(X+Y)+16]Y=900.解方程组Hurry up!
[(900/(X+Y)+4]X=900;[900/(X+Y)+16]Y=900.解方程组
Hurry up!

[(900/(X+Y)+4]X=900;[900/(X+Y)+16]Y=900.解方程组Hurry up!
x=-255,y=225/2
or
x=75,y=75/2

化简得：
900/(x+y)+4=900/x
900/(x+y)+16=900/y
左右去分母：
900x+4x^2+4xy=900x+900y
900y+16x^2+16xy=900x+900y
化简：
x^2+xy-225y=0 3
4x^2+4xy-225x=0 4
三式乘四减四式，得：
22...

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化简得：
900/(x+y)+4=900/x
900/(x+y)+16=900/y
左右去分母：
900x+4x^2+4xy=900x+900y
900y+16x^2+16xy=900x+900y
化简：
x^2+xy-225y=0 3
4x^2+4xy-225x=0 4
三式乘四减四式，得：
225x-900y=0
x-4y=0
x=4y
把x=4y代入一式，得：
180/y+4=225/y
解得：y=45/4
x=45

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[(900/(X+Y)+4]X=900;[900/(X+Y)+16]Y=900.解方程组Hurry up! x+x+x+y=60 .x-y=4 x+y=7 900x=1200y , 900x=1200y x+y=7 x+y=7 900x=1200y 嗷 y=x+4/x (x y=|-x.x+4x+5| (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 7x:4y,x:y=( ):( (x-4y)(2x+y)= 5x-4y(y-x)=? 4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? (x+y)(x^2+y^2)(x-y)(x^4+x^4)=? x/3=y/4,求(x*x-xy)/(x*x+y*y)的值 x-y+5x-4x= ?x-y+5x-4x= ? x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 x*x+2x+y*y-4y+5=0 x= y=