Các câu hỏi tương tự
tim x , y biet x/2= y/3 và xy = 10
tim x,y,z biet xy=3,yz=6,xz=8
tim x, y biet:2/x= 3/y va xy=96
tim xy biet x+y=x/y=3*(x-y)
tim x y thuoc z biet (x+y).2=xy
bai 1: Tim x biet
\(\hept{\begin{cases}x-y=\frac{3}{10}\\y\left(x-y\right)=-\frac{3}{50}\end{cases}}\)
bai 2: Tim x, y biet:
x+\(\left(-\frac{31}{12}\right)^2\)=\(\left(\frac{49}{12}\right)^2\)-x=y2
Bai 9: Tim x,y,z biet:
(x-1)2+(x+y)2+(xy-z)2=0
toan 7 tim x,y,z biet (xy/2y+4x)=(yz/4z+6y)=(zx/6x+2z)=(x^2+y^2+z^2)/2^2+4^2+6^2
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 va y biet
1. x/3=y/4 va xy=192