速算奧數(shù)題及答案

二年級奧數(shù)題及答案:速算

4×135×25= 38×25×6=

　　答案與解析：

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.