选择自己喜欢的方法,计算下面各题.

1个回答

  • 解题思路:①运用除法的性质简算;

    ②根据乘法结合律简算;

    ③先算小括号里面的加法,再算括号外的除法;

    ④先算小括号里面的减法,再算中括号里面的乘法,最后算括号外的除法;

    ⑤⑥可据乘法分配律进行计算即可.

    ①12.5÷2.5÷0.4

    =12.5÷(2.5×0.4)

    =12.5÷1

    =1.25;

    ②2.6×1.9÷2.6×1.9

    =(2.6÷2.6)×(1.9×1.9)

    =1×3.61

    =3.61;

    ③(7.7+1.54)÷0.7

    =9.24÷0.7

    =13.2;

    ④10.8÷[(4.62-1.92)×4]

    =10.8÷[2.7×4]

    =10.8÷10.8

    =1;

    ⑤3.8×6.7+3.3×3.8

    =3.8×(6.7+3.3)

    =3.8×10

    =38;

    ⑥1.28×0.29-0.29×0.28

    =0.29×(1.28-0.28)

    =0.29×1

    =0.29.

    点评:

    本题考点: 小数四则混合运算.

    考点点评: 考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.