Question

tính nhanh

2.31.12+4.6.42+8.27.3=?

Answer 1

( 2 x 12 ) x 31 + ( 4 x 6 ) x 42 + ( 8 x 3 ) x 27

=( 31 + 42 +27 ) x 24

=100 x 24

= 2400

Answer 2

 2.31.12 + 4.6.42 + 8.27.3

= ( 2.12) .31 + ( 4.6) . 42 + ( 8.3) 27

= 24.31 + 24.42 + 24.27

= 24. (31 + 42 + 27)

= 24. 100

= 2400