Do (-x)^2 = x^2 nên:
=> (2/5)^x > (2/5)^3 × (2/5)^2
=> (2/5)^x > (2/5)^5
=> x > 5 (t/ m).
Chúc bạn học tốt!!😀😀
Chương I : Số hữu tỉ. Số thực
Các câu hỏi tương tự
Tim x biet:|x-2|+|3-2x|=2x+1
Tim x,y:
|x-4|+3|3x-2|-2|2-x|=x+1
||2x-3|-3/4|=5/6
|1/2-|3-x||=2x-1
|x-2007|+2004|y-2008|\(\le\)0
3|x-2y|+4|y+1/2|=0
tim cap so x,y biet:
\(\dfrac{1+3.y}{12}\)\(=\dfrac{1+5.y}{5.x}\)\(=\dfrac{1+7.y}{4.x}\)
3.a: -3/2-2x+3/4=-4
b: (-2/3.x-3/5).(3/-2-10/3)=2/5
c: x/2-(3x/5-13/5)=-(7/5+7/10x)
d: (3/2-5/11-3/13).(2x-2)=(-3/4+5/22+3/26)
e: 2/3x-3/12=4/5-(7/x-2)
Tim x
a, 2(x- 1/3)+3x=7/4
b, x-1/3 == 27/x-1
c, 2x +1/x+3= 2x+3/ x +5
Tick nha!
Tìm x
X-1/5 = 2x+1/3
X+3/2x-5 = 2/3
2/3 . 3x+1 - 7 . 3x = -405
2x+3 . 5 + 2x+2 . 3 + 2x+1 . 24 = 200
Tim các số x, y, z thuộc Q biết (x+y) :(5-z) :(y+z) :(9+y) =3:1:2:5
Giúp mình nhé
Mình đang gấp
TÌM X, BIẾT:
a) 3 . ( 1/2 - x ) + 1/3 = 7/6 - x
b) 4 . ( 1/2 - x ) - 5 . ( x - 3/10 ) = 7/4
c) -3/2 . ( 4/5 - 2/3 ) + x = 4 . ( x - 1/2 )
d) 2 . ( 3/2 - x ) - 1/3 = 7x - 1/4
e) 1/5 . ( -3/5 -10 ) + 5x = x - 2/3
f) -3/2 . ( 5 - 1/6 ) + 4 . ( x - 1/2 ) = 1
~ PLEASE HELP ME ~
Tim x,y va z biet
\(\dfrac{x}{3}=\dfrac{y}{4}=\dfrac{z}{5}\)va \(2x+3y+5z=86\)