用简便方法计算下面各题.4.37×0.55+56.3×0.055;2.5×1.6×1.25;0.59×9.8;53.6×

1个回答

  • 解题思路:(1)根据乘法分配律简算即可;

    (2)首先把1.6分成2×0.8,然后根据乘法结合律简算即可;

    (3)首先把9.8分成10-0.2,然后根据乘法分配律简算即可;

    (4)根据乘法分配律简算即可.

    (1)4.37×0.55+56.3×0.055

    =43.7×0.055+56.3×0.055

    =(43.7+56.3)×0.055

    =100×0.055

    =5.5

    (2)2.5×1.6×1.25

    =2.5×2×0.8×1.25

    =(2.5×2)×(0.8×1.25)

    =5×1

    =5

    (3)0.59×9.8

    =0.59×(10-0.2)

    =0.59×10-0.59×0.2

    =5.9-0.118

    =5.782

    (4)53.6×38.2+536×6.08+53.6

    =53.6×38.2+53.6×60.8+53.6

    =53.6×(38.2+60.8+1)

    =53.6×100

    =5360

    点评:

    本题考点: 运算定律与简便运算.

    考点点评: 此题主要考查了乘法运算定律在简算中的应用.