速算奥数题及答案

2021-08-03 02:46:52华夏高考网

二年级奥数题及答案:速算

4×135×25=38×25×6=

答案与解析:

4×135×25

=(4×25)×135

=100×135=13500.

38×25×6

=19×2×25×2×3

=19×(2×25×2)×3

=19×100×3

=1900×3=5700.