Question

Tính nhanh: 

1,42 x 300 + 14,2 x 57 + 14,2 x 14 - 142 x 0,1

 

Answer 1

\(=1,42.30.10+14,2.57+14,2.14-14,2\\ =14,2.30+14,2.57+14,2.14-14,2\\ =14,2\left(30+57+14-1\right)\\ =14,2.100\\ =1420\)

Answer 2

=1,42 x 30 x 10+14,2 x 57+14,2 x 14−14,2

=14,2 x 30+14,2 x 57+14,2 x 14−14,2

=14,2(30+57+14−1)

=14,2 x 100

=1420