急:4*[x+(40x-4x)/(50+4)]+40[y-(40x-4x)/(50+4)]=40x+4y
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急:4*[x+(40x-4x)/(50+4)]+40[y-(40x-4x)/(50+4)]=40x+4y
x/4=[(y-x)/40]+[(y—x—x)/50](要求过程详细)
x/4=[(y-x)/40]+[(y—x—x)/50](要求过程详细)
4*[x+(40x-4x)/(50+4)]+40[y-(40x-4x)/(50+4)]=40x+4y
4x+(4*36x)/54+40y-(40*36x)/54=40x+4y
-(36²x)/54=36x-36y
-24x=36(x-y)
-2x=3x-3y
5x=3y
x=0.6y
x/4=[(y-x)/40]+[(y—x—x)/50]
x/4=y/40-x/40+y/50-2x/50
x/4+x/40+x/25=y/40+y/50
50x/200+5x/200+8x/25=9y/200
63x=9y
7x=y
x=1/7y
4x+(4*36x)/54+40y-(40*36x)/54=40x+4y
-(36²x)/54=36x-36y
-24x=36(x-y)
-2x=3x-3y
5x=3y
x=0.6y
x/4=[(y-x)/40]+[(y—x—x)/50]
x/4=y/40-x/40+y/50-2x/50
x/4+x/40+x/25=y/40+y/50
50x/200+5x/200+8x/25=9y/200
63x=9y
7x=y
x=1/7y
急:4*[x+(40x-4x)/(50+4)]+40[y-(40x-4x)/(50+4)]=40x+4y
(x+y)(x+2y)(x+3y)(x+4y)=-40
x(x-y)+4(y-x)因式分解
x-y+5x-4x= ?
y=x+4/x (x
3X+5Y=40 4X+3Y=46 Y=?X=?
已知:3X-2Y=40,X-4Y=-50,利用因式分解求(X+Y)^2-(2X-3Y)^2的值
y=(x+4)(x+9)/x (x>0)
x^2-y^2/x+y-4x(x-y)+y^2/2x-y,
x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
(2x-y)²-4(x-y)(x+2y)
(2x-y)^2-4(x-y)(x+2y)