x-y=2(x+y) x-y=x;y x=3y
x-y=2x+2y 3y-y=3y;y x=3.3/2
x=3y 2y=3 x=9/2
y=3/2
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x-y=2(x+y) x-y=x;y x=3y
x-y=2x+2y 3y-y=3y;y x=3.3/2
x=3y 2y=3 x=9/2
y=3/2
tim x,y biet:x-y/3=x+y/13=xy/200.
Tim cac so huu ti x,y
a,x-y=2(x+y)=x:y
b,x+y=xy=x:y
tim cac so nguyen x, y biet:x/4-1/y=1/2 (giai chi tiet gium nha ban!thanks!!!)
tim x,y,z biet:x/3=y/4,y/5=z/7 va 2x+3y-z=124
tim x,y,z biet x-y=x:y=2.(x-y)
Tim x, y biet: x+y=x:y=3(x-y)
Tim x, y biet: x+y=x:y=3(x-y)
Tim 2 so huu ti x va y sao cho x-y=x.y=x:y(y khac 0)
Tim x,y biết x+y=3(x-y) va x-y=-x:y