脱式计算 1.98÷0.18÷0.116.25÷0.25×0.67.8÷2.6÷0.3(3.2+0.128)÷0.84.

1个回答

  • 解题思路:(1)(2)(3)从左往右依次计算即可求解;

    (4)先算小括号里面的加法,再算括号外面的除法;

    (5)先算乘除法,再算减法;

    (6)先算小括号里面的减法,再算中括号里面的乘法,最后计算括号外面的除法.

    (1)1.98÷0.18÷0.11

    =11÷0.11

    =100

    (2)6.25÷0.25×0.6

    =25×0.6

    =15

    (3)7.8÷2.6÷0.3

    =3÷0.3

    =10

    (4)(3.2+0.128)÷0.8

    =3.328÷0.8

    =4.16

    (5)4.3×0.8-2.6÷1.3

    =3.44-2

    =1.44

    (6)0.48÷[(6.1-4.6)×0.8]

    =0.48÷[1.5×0.8]

    =0.48÷1.2

    =0.4

    点评:

    本题考点: 小数四则混合运算.

    考点点评: 考查了小数四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.