x2 - 25x4=0
<=>x2(1-25x2)=0
<=>x2[12-(5x)2]=0
<=>x2(1-5x)(1+5x)=0
=>x2=0 =>x=0
hoặc 1-5x=0 =>1=5x <=>x=0,2
hoặc 1+5x=0 =>1=-5x <=> x=-0,2
tim x thoa man -x^2+6x=0
so nguyen x thoa man (x+x2)<0
tim x va y thoa man: x^2 - xy -2y^2 - 1 = 0
Tim gia tri x duong thoa man?
|x-9|+(-|2x|)=0
tim gia tri cua x thoa man 3x - 5.2.4 + 2.23=0
tim cac so nguyen x,y thoa man: 1/x-1/3=1/y voi x,y khac 0
tim cac so tu nhien x y z khac 0 thoa man dieu kien x+y+z = xyz
voi x khac 0 thoa man f(1)=1 va f(1/x)=1/x^2+f(x) va f(x1+x2)=(x1+x2)chung minh f(5/7)=5/7
Tim 4 so a,b,x,y khac 0 thoa man
x=a-y va y=x×b/x-b
