用简便方法计算. 36×25 102×24 35×16×125 137×15-15×37.
1个回答

解题思路:(1)把36看作9×4,运用乘法结合律简算;

(2)把102看作100+2,运用乘法结合律简算;

(3)把16看作2×8,运用乘法结合律简算;

(4)运用乘法结合律简算.

(1)36×25,

=9×4×25,

=9×(4×25),

=9×100,

=900;

(2)102×24,

=(100+2)×24,

=100×24+2×24,

=2400+48,

=2448;

(3)35×16×125,

=35×2×8×125,

=(35×2)×(8×125),

=70×1000,

=70000;

(4)137×15-15×37,

=15×(137-37),

=15×100,

=1500.

点评:

本题考点: 运算定律与简便运算;整数四则混合运算.

考点点评: 完成本题,要注意分析式中数据,运用所学的运算定律,灵活简便.