x*(x-y)-y*(x-y)=3/10-(-3/50)=3/10+3/50=9/25
(x-y)*(x-y)=9/25
(x-y)^2=9/25
x-y=3/5 hoac x-y=-3/5
Tu đo tim x,y
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x*(x-y)-y*(x-y)=3/10-(-3/50)=3/10+3/50=9/25
(x-y)*(x-y)=9/25
(x-y)^2=9/25
x-y=3/5 hoac x-y=-3/5
Tu đo tim x,y
tim x va y biet
a)x/18=y/15 va x-y=-30
b)7*x=9*y va 10*x-8*y=68
c)(x1/2)^50 +(y+1/3)^40=o
Tim x,z,y biet
x/2=y/3;y/4=z/5 va x+y-z=10
tim 3 so x y va z biet 2x=3y=1,5z va x+y-z=10
tim x,y,z biet : x/2=y/3=z/5 va x-2y+z=10
Tim x,y,z biet x-1, y+3, z-5 voi ti le 2,4,6 va -3x - 4y + 3z = 50
tim x,y,z biet
x+1/2 = y-2/3 = z-3/4 va 2x + 3y - z = 50
tim x,y,z biet
x+1/2 = y-2/3 = z-3/4 va 2x + 3y - z = 50
tim x, y thuoc Z biet :
a. x/6=5y va x<y
b, -3/y= x/4 va x<0<y
c, x+3/ y+5= 3/5 va x+y=6
tim 2 so x va y,biet 7x = 3 y va x-y=16