Tìm x biết:

a, \(81^{-2x}.27^x=9^5\)

b, \(2^x+2^{x+3}=144\)

c, \(2^{x-1}+5.2^{x-2}=7.32\)

Tính : 3^7.2^8 / 6^7

Bài 1:1)\(\left(\dfrac{-3}{2}\right)^x\)=\(\dfrac{9}{4}\)

2)\(3^{2x+2}=9^{10}\)

3)\(3^{3-2x}=27^{13}\)

4)\(5.3^x=7.3^5-2.3^5\)

Giúp mk với

Tính m , n ,p biết :

a) \(\left(\dfrac{1}{3}\right)^m=\dfrac{1}{81}\) b) \(\left(\dfrac{3}{5}\right)^n=\left(\dfrac{9}{25}\right)^5\)

c) \(\left(-0,25\right)^p=\dfrac{1}{256}\)

1. Tính:

C= \(\left(\dfrac{1}{2^2-1}\right)\left(\dfrac{1}{3^2-1}\right)\left(\dfrac{1}{4^2-1}\right)-.\left(\dfrac{1}{100^2-1}\right)\)

2. Tìm x:

\(\left(\dfrac{2}{5}\right)^x>\left(\dfrac{5}{2}\right)^{-3}.\left(\dfrac{-2}{5}\right)^2\)

Help me!!!

(X+1):25=4:(X+2)

(X+1)/25=4/(X+2)

Tìm x:

4/16 = 100/x2 -41

Bài1: tìm x biết

a) l x - 3,5 l = 7,5

b) l x + \(\dfrac{4}{5}\) l - \(\dfrac{1}{2}\) = 0

c) 3,6 - l x - 0,4 l = 0

d) \(\dfrac{-5}{12}\) : | \(\dfrac{-5}{6}\) : x | = \(\dfrac{-5}{9}\)

e) | x - 3,5|+|4,5- x|=0
bài 2:tính hợp lý

a) (-4,3)=[(-7,5)=(4,3)]

b) 45,3 + [(7,3)+(-22)]

c) [(-11.7)+5.5]+[11.7+(2.5)]

d) [(-6.8)+(-56.9)]+[2.8+5.9]

-4/13 x 5/17 + -12/13 x 4/17 + 4/13

thực hiện phép tính

mn giúp vs mk đag rất gấp