\(7.4^{x+1}-5.4^{x+1}=2048\)
\(\Rightarrow4^{x+1}.\left(7-5\right)=2048\)
\(\Rightarrow4^{x+1}.2=2048\)
\(\Rightarrow4^{x+1}=2048:2\)
\(\Rightarrow4^{x+1}=1024\)
\(\Rightarrow4^{x+1}=4^5\)
\(\Rightarrow x+1=5\)
\(\Rightarrow x=5-1\)
\(\Rightarrow x=4\)
Vậy \(x=4.\)
Chúc bạn học tốt!
b1 :tính
a) N = (1/2 - 1). (1/3 - 1). (1/4 - 1) .... (1/2016 - 1). (1/2017 - 1)
b) P = (-1/1/2). (-1/1/3). (-1/1/4) ... (-1/1/2015). (2016/01/01)
c) Q = 1/13 + 3 / 13,23 + 3 / 23,33 + ... + 3 / 2013,2023
d) R = 1 / 2.017,2016-1 / 2.016,2015-1 / 2015,2014 - ... -. 1 / (x + 1999) (x + 2000)
b2 : tìm x, biết :
a) 1 / (x + 1). (x + 2) + 1 / (x + 2). (x + 3) + 1 / (x + 3). (x + 4) + ... + 1 / (x + 1999). (x + 2000) = 1 / x + 200 = 1/5
b) 2 / (x + 1). (x + 3) + 3 / (x + 3). (x + 6) + 4 / (x + 6). (x + 10) + ... + 10 / (x + 45). (x + 55) + 1 / x + 55 = 1/6
( chú ý : / là phần nha )
1. CMR:1/1.2+1/3.4+1/5.6+....+1/49.50=1/26+1/27+.......+1/50
2.A=1/1.2+1/2.3+.....+1/99.100.CMR:7/12<A<5/6
3.tim x
a.x+1/10+ x+1/12 +x+1/14 + x+1/16 + x+1/18 + x+1/20
b.x+1/2000 + x+2/1999 =x+3/1998 + x+4/1977
giup minh nha cac ban
a, 4*(3-x)^10=9(3-x)^8
b, (x-1)^x+3=(x-1)^x+1
1. tìm x biết
a, (2x - 3)\(^2\) = |3 - 2x|
b, (x - 1)\(^2\) + (2x - 1)\(^2\) = 0
c, 5 - x\(^2\) = 1
d, x - 2\(\sqrt{x}\) = 0
g, (x - 1) + \(\dfrac{1}{7}\) = 0
Tìm x biết :
1)7(x-1)+2x(1x)=0
2)(x-3/4)(x+1/2)>0
3)x-0,5/x+1<0
Bài 1 : Tìm x , biết :
a. |x-1|+|x-2|+....+|x-8| = 22
b. |x-1|+|x-2|+|x-3|+...+|x-100| = 2500
Bài 2 :
Tìm x , biết :
|x+1|+|x+2|+....+|x+100| = 605.x
Giúp tớ với ?
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
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,biết
1) 1 7/9:2 2/3=2 2/3:x
2)1 2/3:x/4=6:0,3.
3) x-3/x-2=4/7
4) |x|+3,5=0
5)|x+1/3|-4=1
