Question

1.                Tính bằng cách thuận tiện nhất:

a.                 34,67 + 5,42 + 4, 58

b.                15,27 x 2  x 0,5

c.                 45,28  x45 + 45,28 x 55

Answer 1

`a,`

`34,67+5,42+4,58`

`= 34,67+(5,42+4,58)=34,67+10=44,67`

`b,`

`15,27 \times 2 \times 0,5`

`= 15,27 \times (2 \times 0,5)`

`= 15,27 \times 1=15,27`

`c,`

`45,28 \times 45 + 45,28 \times 55`

`= 45,28 \times (45+55)`

`= 45,28 \times 100=4528`

Answer 2

a.

34,67 + 5,42 + 4,58

= (34,67 + 5,42) + 4,58= 40,09 + 4,58 = 44,67 

b. 15,27 x 2 x 0.5

= (15,27 x 2) x 0.5 = 30,54 x 0,5 = 15,27

c. 45,28  x45 + 45,28 x 55

=  45,28 x (45 + 55)

= 45,28 x 100 = 4528