1. 口算。
3.5×0.01 =
1.25÷0.25 =
0×9.8 =
4.8 + 5.2 =
0.5×0.4 =
4÷0.25 =
8.1÷9 =
2.5×4 =
6 - 0.025 =

0.035
5
0
10
0.2
16
0.9
10
5.975

2. 判断。(对的打“√”,错的打“×”。)
(1)小数四则混合运算的运算顺序与整数四则混合运算的运算顺序相同。()
(2)在算式26.84 + 34.6÷0.2×4中,先算0.2×4,再算34.6÷0.8。()
(3)23.5 + 76.5÷0.25 + 0.75 = 100÷1 = 100()
(4)1 - 0.2÷1 - 0.2 = 1()

(1)√
(2)×
(3)×
(4)×

3. 计算。(能简算的要简算。)
(1.48 + 0.38÷4)×2
[2800 - (750 - 380)]÷81
0.94×2.5 + 0.94×7.5
9.28×13 - 9.28×4 + 9.28

(1.48 + 0.38÷4)×2
= (1.48 + 0.095)×2
= 1.575×2
= 3.15
[2800 - (750 - 380)]÷81
= [2800 - 370]÷81
= 2430÷81
= 30
0.94×2.5 + 0.94×7.5
= 0.94×(2.5 + 7.5)
= 0.94×10
= 9.4
9.28×13 - 9.28×4 + 9.28
= 9.28×(13 - 4 + 1)
= 9.28×10
= 92.8