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.