tim x,y biet x^2+y^2/x^2+1+y^2=x^2/x^2+1 + y^2/y^2+1
tim x , y tu nhien biet (x^2+1)(2^x+2)(2^x+3)(2^x+4) +15^y=1679
tim x y biet |x-1|+|x-2|+|y-3|+|x-4|=3
tim x,y,z biet 4/x+1=2/y-2=3/z+2 va xyz=12
Tim x biet :
a) x-1/2=y-2/3=z-3/4 va 2/x+3/y-z
tim x,y,z biet y+z+1=x+z+2/y=x+y-3/2=1/x+y+z
Tim cac sox y z biet x-1/2=y-2/3=z-3/4 va x-2*y+3*z=14
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
tim x biet: \1/2-1/3\=-1/4-y
\x*(x2-5/40\=x
