1 直接写出结果。
6.84 + 9.75 =
14.3 - 5.67 =
0.825 + 3.194 =
20 - 8.326 =
0.45 × 2.6 =
3.14 × 0.8 =
1.25 × 4.8 =
0.072 × 1.5 =
8.46 ÷ 0.9 =
1.008 ÷ 4.8 =
5.6 ÷ 0.7 =
14.7 ÷ 2.1 =
(5.6 - 2.75) × 0.8 =
3.4 + 6.5 × 0.2 =
10.8 ÷ (2.1 + 1.5) =
7.2 ÷ 1.2 - 3.05 =

16.59 8.63 4.019 11.674 1.17 2.512 6 0.108
9.4 0.21 8 7 2.28 4.7 3 2.95

2 递等式计算。（能简便的用简便方法计算）
(1) $146.38 - (57.19 - 23.62)$
(2) $238.54 + 176.45 - 119.37 - 65.63$
(3) $12.5 × (0.32 × 25)$
(4) $8.64 × 1.25 ÷ 0.6$
(5) $(287.5 - 62.5) ÷ 25 × 4.8$
(6) $156.4 ÷ 4.6 + 32.7 × 1.5$
(7) $4.17 × 88.3 + 41.7 × 1.17$
(8) $36.4 ÷ 0.8 - 22.4 ÷ 0.8$

(1) $146.38-(57.19-23.62)=(146.38+23.62)-57.19=170-57.19=112.81$
(2) $238.54+176.45-119.37-65.63=(238.54+176.45)-(119.37+65.63)=414.99-185=229.99$
(3) $12.5×(0.32×25)=12.5×0.8×0.4×25=100$
(4) $8.64×1.25÷0.6=8.64÷0.6×1.25=14.4×1.25=18$
(5) $(287.5-62.5)÷25×4.8=225÷25×4.8=9×4.8=43.2$
(6) $156.4÷4.6+32.7×1.5=34+49.05=83.05$
(7) $4.17×88.3+41.7×1.17=4.17×88.3+4.17×11.7=4.17×(88.3+11.7)=4.17×100=417$
(8) $36.4÷0.8-22.4÷0.8=(36.4-22.4)÷0.8=14÷0.8=17.5$