Đáp án D 

Đổi  2 , 6 % = 2 , 6 : 100 = 26 10 : 100 = 13 500

Số đó là:  12 , 5 : 13 100 = 125 100 . 500 13 = 625 3

Vậy số cần tìm là:  625 3  .

Do 2,6% của số đó là 12,5 nên số đó là:

\(12,5:2,6\%=\dfrac{6250}{13}\)

\(\dfrac{12,5.100}{2,6}=\dfrac{6250}{13}\)

Vậy số cần tìm là \(\dfrac{6250}{13}\)

\(\dfrac{625}{3}\)

a) 84                    

b) -18

c) 60                    

d) 16

a ) 7,2 : 2 3 = 54 5 b ) − 5 : 1 3 7 = − 7 2

c ) 14 : 2 7 = 49 d ) − 2 3 : 3 2 5 = − 10 51

Bài 1:

E = \(\dfrac{1+\left(\dfrac{1}{99}+1\right)+\left(\dfrac{2}{98}+1\right)+...+\left(\dfrac{98}{2}+1\right)}{\dfrac{1}{2}+\dfrac{1}{3}+...+\dfrac{1}{100}}\)

E = \(\dfrac{\dfrac{100}{100}+\dfrac{100}{99}+...+\dfrac{100}{2}}{\dfrac{1}{100}+\dfrac{1}{99}+...+\dfrac{1}{2}}\)

E = \(\dfrac{100\cdot\left(\dfrac{1}{100}+\dfrac{1}{99}+...+\dfrac{1}{2}\right)}{\dfrac{1}{100}+\dfrac{1}{99}+...+\dfrac{1}{2}}\)

E = 100

Ta có:

F = \(\dfrac{\left(1-\dfrac{1}{7}\right)+\left(1-\dfrac{2}{8}\right)+...+\left(1-\dfrac{94}{100}\right)}{\dfrac{1}{35}+\dfrac{1}{40}+...+\dfrac{1}{500}}\)

F = \(\dfrac{\dfrac{6}{7}+\dfrac{6}{8}+...+\dfrac{6}{100}}{\dfrac{1}{35}+\dfrac{1}{40}+...+\dfrac{1}{500}}\)

F = \(\dfrac{6\cdot\left(\dfrac{1}{7}+\dfrac{1}{8}+...+\dfrac{1}{100}\right)}{\dfrac{1}{5}\cdot\left(\dfrac{1}{7}+\dfrac{1}{8}+...+\dfrac{1}{100}\right)}\)

F = 6 : 1/5

F = 30

=> E - 2F = 100 - 30*2

                = 100 - 60

                = 40

Vậy E - 2F = 40

thanks you very much!