Question

Tính nhanh:

a) 31 . 14 + 62 . 43

b) -135 . 24 +135 . (-75) - 135

Answer 1

a)31.14+31.(2.43)

=31.14+31.86

=31(14+86)

=31.100

=3100

b)135.(-24)+135.(-75)-135.1

=135[(-24)+(-75)-1]

=135.(-100)

=-13500

 

 

Answer 2

a, 31 . 14 + 62 . 43

= 31.14 + 31.86

= 31.(14 + 86)

= 31.100

- 3100

b, -135 . 24 +135 . (-75) - 135

= -135.(24 + 75 + 1)

= -135.100

= -13500