1. 直接写出得数。（28☆）
7.5-2.4=
4×0.25=
7.2÷4=
1.25×5×8=
3.61+2.2=
13.6+6.8=
0.56+4.44=
2.9+3.7+2.1=
2.4÷0.2=
5.4+2.7=
30.06÷3=
7.7-2.8+7.3=
40-9.6=
0.9×0.9=
3.06×3=
11-0.97-0.03=
1.7×200=
0.1-0.02=
2.5×8=
0.5×18×20=
269+1.7=
10.2-5.9=
0.88+1.22=
8.5+1.5×3=
0.25×40=
1-0.11=
10.5÷3=
2.5+1.5×3=
9.09+1.01=
33.6÷3=
0.72÷0.9=
30÷20×4=
360÷0.6=
450÷3=
840÷70=
60÷0.4÷25=
9.9×100=
0.01+1.9=
4.1×0.7=
10.8-5.4-4.6=
4×1.6=
1.1-0.96=
368+212=
3.1×4×10=
0.38×0.2=
0.4÷0.5=
4.12÷2=
3.6×3÷0.3=
7.8÷2=
0.38÷0.1=
0.8×2.5=
101×0.9-0.9=
7.5÷5=
7.8÷0.2=
9.45+0.65=
0.5×1.7×20=

1. 5.1 1 1.8 50
5.81 20.4 5 8.7
12 8.1 10.02 12.2
30.4 0.81 9.18 10
340 0.08 20 180
270.7 4.3 2.1 13
10 0.89 3.5 7
10.1 11.2 0.8 6
600 150 12 6
990 1.91 2.87 0.8
6.4 0.14 580 124
0.076 0.8 2.06 36
3.9 3.8 2 90
1.5 39 10.1 17

2. 计算下面各题,能简算的要简算。(27☆)
$37×125+125×43$
$(14×102-921)÷39$
$[936÷(27+25)]×24$
$16.4+4.62-1.02$
$2024÷92×35$
$47.26-12.7-7.26$
$47×49.9+47$
$(5.9+4.5)÷1.3-1.3$
$0.4×[(20-1.4)×2]$

2. 10000 13 432
20 770 27.3
2392.3 6.7 14.88