a. \(\dfrac{81}{3^{2x+1}}=3\)
b.\(2^x+2^{x+2}=80\)
c.\(\dfrac{16^{x+2}}{8^x}=4^5\)
d. \(2^x+2^{x+1}+2^{x+2}=112\)
1.Tìm x, biết:
a. 2x ; b. 5x c. 3x : 35 d. \(\dfrac{16}{2^x}=2\) e. 8x : 2x f. 2x . 3x = 36 g. \(\dfrac{\left(-3\right)^n}{81}=-27\)
Tìm x:
1)\(\left(x-2\right)^3=-27\)
2)\(\left(2x-3\right)^2=25\)
3)\(3^{x-1}=\dfrac{1}{243}\)
4)\(2x+2^{x+3}=144\)
5)\(\left(2x-3\right)^2=16\)
6)\(\left(3x-2\right)^5=-243\)
7)\(\left(7x+2\right)^{-1}=3^{-2}\)
Chứng Minh Rằng
\(3^{n+3}+3^{n+1}+2^{n+3}+2^{n+2}⋮6\)
Giúp mình với
1) a) (x-\(\dfrac{1}{2}\))^2=0
b) (x-2)^2=1
c)(2x-1)3=-8
d)(x+\(\dfrac{1}{2}\))^2=\(\dfrac{1}{16}\)
Bài 1: Tính
1/ x: -\(\frac{-1}{2}\)=\(\frac{-1}{2}\)
2/ (\(\frac{3}{4}\))5*x=(\(\frac{5}{4}\))7
3/ \(\frac{16}{2^n}\)=2
4/ \(\frac{-3^n}{81}\)=-27
MAI TỚ CẦN GẤP CÁC CẬU GIÚP TỚ NHÉ! CẢM ƠN MN TRƯỚC
a, A= x+1 trên x-2 ( x khác 2 )
b, B= 2x-1trên x +5 ( x khác -5 )
c, C= 10x-9 trên 2x-3
1: Tính : \(\dfrac{\left(\dfrac{2}{5}\right)^7.5^7+\left(\dfrac{9}{4}\right)^3:\left(\dfrac{3}{16}\right)^3}{2^7.5^2+512}\) 2 . Tìm x biết :\(\left(5.x+1\right)^2=\dfrac{36}{49}\)
(x-2)2x+3= (x-2)2x+1 (x thuộc N )
(2x - \(\frac{1}{3}\))2x = (x+1)2x(x thuộc N)
1 tính
a. \((\left|-5\right|7^4+3^2.2\dfrac{2}{5}):(7^5.125.7^3.50)\)
b. \((\dfrac{3^2}{9}.\dfrac{3^3}{81})^{12}:(\dfrac{3^6}{81^2})^{10}\)
c. \([(\dfrac{1}{2})^2.(\dfrac{1}{3})^4.\dfrac{2}{7}]:\left(\dfrac{1}{3}\right)^{-2}.\dfrac{-2^2}{7}\)