\(3B=5+\left(\dfrac{5}{3}\right)+\left(\dfrac{5}{3}\right)^2+...+\left(\dfrac{5}{3}\right)^{20}\)
=>\(2B=5-\left(\dfrac{5}{3}\right)^{21}=\dfrac{5\cdot3^{21}-5}{3^{21}}\)
=>\(B=\dfrac{5\cdot3^{21}-5}{3^{21}\cdot2}\)
\(3B=5+\left(\dfrac{5}{3}\right)+\left(\dfrac{5}{3}\right)^2+...+\left(\dfrac{5}{3}\right)^{20}\)
=>\(2B=5-\left(\dfrac{5}{3}\right)^{21}=\dfrac{5\cdot3^{21}-5}{3^{21}}\)
=>\(B=\dfrac{5\cdot3^{21}-5}{3^{21}\cdot2}\)
xin hiểu / là phần
a/ 3 và 1/2 - 4/5 - 8 và 1/2 -1/5 -(2021)^0
b 32^5/ 16^5 - (0.2)^100 * (5)^100 -√8181 + /-21/
c 3/2* 16/21 + 3/2 * 5/21 - (- 1/10) ^0 - /-20/
xin hiểu / là phần
a/ 3 và 1/2 - 4/5 - 8 và 1/2 -1/5 -(2021)^0
b 32^5/ 16^5 - (0.2)^100 * (5)^100 -√8181 + /-21/
c 3/2* 16/21 + 3/2 * 5/21 - (- 1/10) ^0 - /-20/
xin hiểu / là phần
a/ 3 và 1/2 - 4/5 - 8 và 1/2 -1/5 -(2021)^0
b 32^5/ 16^5 - (0.2)^100 * (5)^100 -\(\sqrt{81}\) + /-21/
c 3/2* 16/21 + 3/2 * 5/21 - (- 1/10) ^0 - /-20/
A= [(-3/5 + 4/9):2/7-(-14/9+2/5):2/7]:(32/7.71/2-32/7.51/2)
Tính:
a) 25 . 53 . \(\frac{1}{625}\) . 52
b) 4. 32 : (23 . \(\frac{1}{16}\))
c) 52 . 35 . (\(\frac{3}{5}\))2
Bài 1: Tìm x,y,z:
x : 4 = y : 5 và 2x + 2y = 33
\(\frac{x}{5}=\frac{y}{3}=\frac{z}{5}\) và \(2x^2+2y^3+2y^4=200\)
Rút gọn:
a) \(\dfrac{9^3}{\left(3^4-3^3\right)^2}\)
b)\(\dfrac{\left(5^4-5^3\right)^2}{1255}\)
c)\(\dfrac{32^5.81^4}{16^5.27^5}\)
d)\(\dfrac{20^{10}.81^4}{19^2.75^5}\)
e)\(\dfrac{23^3-5^5}{125}\)
f)\(\dfrac{16^4-8^5}{48}\)
Tìm x
a) 2x+3/24 = 3x-1/32
b) x+1/x-2 = 5/6
c) -(x+1)/25 = -4/x+1
d) (5-x).2/25 = -2/x-5
e) x+1/x+4 = x-3/x-2
Câu 1.
a) \(32\frac{1}{4}:\frac{5}{7}-42\frac{1}{4}:\frac{5}{7}\)
b) \(1\frac{3}{4}+\frac{-5}{6}.\sqrt{-6^2}-2019^{0^{ }}.\sqrt{\frac{49}{16}}\)