Question

Tính :

a. 1/² + 1/³ + 1/⁴

b. 5/² - 1/³ + 1/⁴

c. 1/².1/³ + 1/².2/³

d. 3/² - 1/³ + 2/⁵

Answer 1

`a, 1/2 +1/3 +1/4`

`= 6/12 + 4/12 + 3/12`

`= (6+4+3)/12`

`= 13/12`

`b,5/2 -1/3 +1/4`

`= 30/12 - 4/12 + 3/12`

`=(30-4+3)/12`

`= 29/12`

`c, 1/2 . 1/3 +1/2 . 2/3`

`= 1/2. (1/3+2/3)`

`= 1/2. 3/3`

`=1/2 .1`

`=1/2`

`d, 3/2 - 1/3 +2/5`

`= 45/30 - 10/30 + 12/30`

`=(45-10+12)/30`

`= 47/30`

 

Answer 2

1/² là 1² hả bạn?

Hay sao?

Answer 3

a: 1/2+1/3+1/4

=12/24+8/24+6/24=26/24=13/12

b: 5/2-1/3+1/4

=30/12-4/12+3/12=29/12

c: =1/2(1/3+2/3)=1/2*3/3=1/2

d: =45/30-10/30+12/30

=47/30