能简算的要用简便方法计算24.1×1.5+7.59×15

1个回答

  • 解题思路:①、⑤运用乘法分配律的逆运算简算;

    ②、③、⑥按运算顺序进行计算;

    ④把8.8拆成8+0.8,与0.125进行简算.

    ①24.1×1.5+7.59×15,

    =2.41×15+7.59×15,

    =(2.41+7.59)×15,

    =10×15,

    =150;

    ②(3.7+17×0.4)÷3.5,

    =(3.7+6.8)÷3.5,

    =10.5÷3.5,

    =3;

    ③75.36÷12-4.32×0.5,

    =6.28-2.16,

    =4.12;

    ④8.8×0.125,

    =(8+0.8)×0.125,

    =8×0.125+0.8×0.125,

    =1+0.1,

    =1.1;

    ⑤7.6×5.3+3.7×7.6,

    =(5.3+3.7)×7.6,

    =9×7.6,

    =68.4;

    ⑥6.6÷(0.68+0.42),

    =6.6÷1.1,

    =6.

    点评:

    本题考点: 小数四则混合运算;运算定律与简便运算.

    考点点评: 此题考查学生的运算顺序,以及灵活运用运算定律进行简算的能力.