Question

tính nhanh

a) 2. 31 .12 + 4 .6. 12 +8.27 .3

Answer 1

2.31.12+4.6.12+8.27.3

=2.31.12+2.2.6.12+8.3.27

=24.31+24.12+24.27

=24.(31+12+27)

=24.70

=1680

Answer 2

2.31.12 + 4.6.12 + 8.27.3

= 2.12.31 + 2.2.6.12 + 2.4.27.3

=2.12.31 + 2.12.12 +2.12.27

=2.12.(31+12+27)

=2.12.70

=1680