a,=23/7

b,1/6

c,177743.79

d,78/200

    Tính:

a, 4 - \(\frac{5}{7}\)= \(\frac{23}{7}\)

b, 12 : 3 = 4

c, 578,97 x 307 = 177743,79

d, 266,22 : 34 =7,83

HOK TỐT

a, 4 - 5/7 = 28/7- 5/7 = 23/7

b, 1/2 : 3 = 1/2 x 1/3 = 1/6

c, 578,97 x 307 = 177743,79

d, 266,22 : 34 = 7,83

Chúc bạn học tốt !

483 : 35 = 13,8

266,22: 34 = 7,83

483:35=13,8

266,22:34=7,83

#học tốt#

Bài 1 : Tính 

a) 4 - 5/7 = .....23/7.............                          

b) 1/2 : 3 = ......1/6........................

c) 266,22 : 34 = ..............7,83............

d) 7/9 + 9/10 = ......151/90...................

e) 3 và 1/2 : 2 và 1/4 = .....14/9...........

g) 21,76 x 2,05 =....44,608......................

h) 75,95 : 3,5 = .........21,7...................

i) 5/6 + 7/12 = .......17/12...................

k) 3 - 5/7 = .....16/7...................

Bài 1 : Tính 

a) 4 - 5/7 = 23/7.                          

b) 1/2 : 3 = 1/6.

c) 266,22 : 34 = 783/100

d) 7/9 + 9/10 = 151/90

e) 3 và 1/2 : 2 và 1/4 = 3

g) 21,76 nhân 2,05 =.5576/125

h) 75,95 : 3,5 = 217/10

i) 5/6 + 7/12 = 97/102

k) 3 - 5/7 = 16/7

`@` `\text {Ans}`

`\downarrow`

`a)`

\(\dfrac{3}{4}+\dfrac{2}{3}+\dfrac{3}{5}\)

`=`\(\dfrac{9}{12}+\dfrac{8}{12}+\dfrac{3}{5}\)

`=`\(\dfrac{17}{12}+\dfrac{3}{5}\)

`=`\(\dfrac{85}{60}+\dfrac{36}{60}\)

`=`\(\dfrac{121}{60}\)

`b)`

\(\dfrac{1}{2}\cdot\dfrac{9}{13}\div\dfrac{27}{26}\)

`=`\(\dfrac{1}{2}\cdot\dfrac{9}{13}\cdot\dfrac{26}{27}\)

`=`\(\dfrac{1}{2}\cdot\dfrac{2}{3}\)

`=`\(\dfrac{1}{3}\)

`c)`

\(\dfrac{2}{7}\cdot\dfrac{1}{9}+\dfrac{2}{7}\cdot\dfrac{2}{9}+\dfrac{1}{3}\cdot\dfrac{5}{7}\)

`=`\(\dfrac{2}{7}\cdot\left(\dfrac{1}{9}+\dfrac{2}{9}\right)+\dfrac{1}{3}\cdot\dfrac{5}{7}\)

`=`\(\dfrac{2}{7}\cdot\dfrac{1}{3}+\dfrac{1}{3}\cdot\dfrac{5}{7}\)

`=`\(\dfrac{1}{3}\cdot\left(\dfrac{2}{7}+\dfrac{5}{7}\right)\)

`=`\(\dfrac{1}{3}\cdot1=\dfrac{1}{3}\)

`d)`

\(11\div\dfrac{5}{2}+11\div\dfrac{7}{3}+11\div\dfrac{35}{6}\)

`=`\(11\cdot\dfrac{2}{5}+11\cdot\dfrac{3}{7}+11\cdot\dfrac{6}{35}\)

`=`\(11\cdot\left(\dfrac{2}{5}+\dfrac{3}{7}+\dfrac{6}{35}\right)\)

`=`\(11\cdot1=11\)

a) 3/4 + 2/3 + 3/5 = 45/60 + 40/60 + 36/60 = 121/60

b) 1/2 x 9/13 : 27/26 = 9/26 x 26/27 = 1/3

c) 2/7 x 1/9 + 2/7 x 2/9 + 1/3 x 5/7 = 2/7 x (1/9 + 2/9) + 5/21 = 2/7 x 1/3 + 5/21 = 2/21 + 5/21 = 1/3

d) 11 : 5/2 + 11 : 7:3 + 11 : 35/6 = 11 x (2/5 + 3/7 + 6/35) = 11 x 1 = 11 

Minh lam cau A) thoi duoc hong

4-5/7=23/7

1/2:3=1/6

578,97x307=177743,79

266,22:34=7,83

4-5/7=28/5

1/2:3=1/6

578,97nhân307=177743.79

266,22:34=7.83

4 - 5/7 = 28/7 - 5/7 = 23/7

1/2 : 3 = 1/2 . 1/3 = 1/6

578,97 * 307 = 177743,79

266,22 : 34 = 7,83

A = 8⁸ + 2²⁰

= (2³)⁸ + 2²⁰

= 2²⁴ + 2²⁰

= 2²⁰.(2⁴ + 1)

= 2²⁰.17 ⋮ 17

Vậy A ⋮ 17