能简便的用简便方法计算. 60×99+1 103×41-123
1个回答

解题思路:(1)先算乘法,再算加法;

(2)(3)(4)利用乘法分配律简算;

(5)先算乘法,再算加法;

(6)利用乘法结合律简算.

(1)60×99+1

=5940+1

=5941;

(2)103×41-123

=100×41+3×41-123

=4100+123-123

=4100;

(3)11×203-3

=11×200+11×3-3

=2200+(33-3)

=2200+30

=2230;

(4)(300+2)×14

=300×14+2×14

=4200+28

=4228;

(5)125+4×95

=125+380

=505;

(6)9×125×8

=9×(125×8)

=9×1000

=9000.

点评:

本题考点: 整数四则混合运算;运算定律与简便运算.

考点点评: 整数的混合运算关键是抓住运算顺序,正确按顺序计算,注意数字特点灵活选用运算定律简算.