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a/7/15;3/5;2/3

b/17/21;11/14;5/7

30 tháng 5 2021

9/15,10/15,7/15 thứ tự từ bé đến lớn là 7/15,9/15,10/15

Bài 3:

a: a*S=a^2+a^3+...+a^2023

=>(a-1)*S=a^2023-a

=>\(S=\dfrac{a^{2023}-a}{a-1}\)

b: a*B=a^2-a^3+...-a^2023

=>(a+1)B=a-a^2023

=>\(B=\dfrac{a-a^{2023}}{a+1}\)

27 tháng 12 2017

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28 tháng 12 2017

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8 tháng 3 2017

Mình chỉ biết làm phần a thôi à :

a , Dãy trên có số số hạng là :

     ( 57 - 1 ) : 2 + 1 = 29 ( số hạng )

Vậy tổng của tất cả các số lẻ  từ 1 đến 57 là :

         ( 57 + 1 ) x 29 : 2 = 841

                 Đáp số : 841

ĐÚNG 100% LUÔN NHA , TK MÌNH NHÉ !!

8 tháng 3 2017

đơn giản

6 tháng 5 2022

a)\(\dfrac{a}{b}=5-\dfrac{3}{5}=\dfrac{25}{5}-\dfrac{3}{5}=\dfrac{22}{5}\)

b)\(\dfrac{a}{b}=\dfrac{5}{6}+\dfrac{4}{7}=\dfrac{35}{42}+\dfrac{24}{42}=\dfrac{59}{42}\)

c)\(\dfrac{a}{b}=\dfrac{3}{5}:\dfrac{2}{3}=\dfrac{3}{5}\times\dfrac{3}{2}=\dfrac{9}{10}\)

6 tháng 5 2022

d)\(\dfrac{a}{b}=3\times\dfrac{2}{7}=\dfrac{6}{7}\)

e)\(\dfrac{a}{b}=\dfrac{7}{5}-\left(\dfrac{2}{5}\times\dfrac{1}{2}\right)=\dfrac{7}{5}-\dfrac{1}{5}=\dfrac{6}{5}\)

13 tháng 9 2015

\(a^3.a^9=a^{12};\left(a^5\right)^7=a^{35}\)

\(\left(a^6\right)^4.a^{12}=a^{24}.a^{12}=a^{36};5^6:5^4-3^3:3^2=25-3=22\)

\(4.5^2-2^5.3^0=100-32=68\)

25 tháng 4 2022

a) a/b = 7/8 - 5/6

a/b = 1/24

b) a/b = 3/4 : 2/3

a/b = 9/8

c) a/b = 5/8 - 5/12

a/b= 5/24

d) a/b = 3/8 - 5/8

a/b = -2/8 -1/4

11 tháng 10 2021

a) \(3^5.3^7=3^{5+7}=3^{12}\)

b) \(a^5.a=a^{5+1}=a^6\)

c) \(5^4:5^3=5^{4-3}=5^1=5\)

d) \(a^3:a^3=a^{3-3}=a^0=1\)

11 tháng 10 2021

a) \(3^5.3^7=3^{12}\)

b) \(a^5.a=a^6\)

c) \(5^4:5^3=5\)

d) \(a^3:a^3=1\)