Question

Tính nhanh:

30.4.12+20.6.32+60.2.56=?

Answer 1

30.4.12+20.6.32+60.2.56

=120.12+120.32+120.56

=120.(12+32+56)

=120.100

=12000

Answer 2

ta có 30 .4.12 + 20.6.32 + 60.2.56  

= ( 30.4 ) . 12 + ( 20.6 ) . 32 + (60.2 ) . 56

= 120.12+120.32 + 120.56

= 120.(12+32+56)

= 120. 100

= 12000