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.