tim cac so x,y,z thuoc Q biet rang (x+y):(5-z):(y+z):(y+9)=3:1:2:5
tim x;y thuoc z biet:
1/x + 1/y = 1/5
tim x,y thuoc z biet x/5=y/3=z/4 và x-z=7
tim x,y thuộc z biết x/3=y/4=z/5 và 2z+3y+5z=86
tim x thuoc z biet
a) (x-1)(x+2) < 0
b) (x+3)(x-5) > 0
tim x thuoc Z biet:
|x-5|+x+3=16
||x+5|-4|=3
Cach lam nua nhe
a, Tim x biet:/x-2/+/3-2x/=2x+1
b, Tim x,y thuoc Z biet:xy+2x-y=5
c, tim x,y,z, biet :2x=3y;4y=5zva 4x-3y+5z=7
a,tim x biet |x-2|+|3-2x|=2x+1
b,tim x,y thuoc Z biet xy+2x-y=5
c, tinh A=(1-1/15)(1-1/21)(1-1/28).....(1-1/210)
tim x;y thuoc Z biet (2*x+5*y+1)*(2|x|+y+x2+x)=105
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