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1. 直接写出得数。
1.8+0.3=
5-0.6=
1.4+0.86=
66.6-0.1-49.9=
4.8-3.7=
9.2+0.8=
3.8÷0.19=
8.6÷2÷4.3=
8.8÷1.1=
3.6×0.5=
7×0.14=
0.72÷80×100=
1.6×0.7=
2.4÷0.04=
15×0.02=
2.5×0.9×0.4=
99÷0.99=
0.15×100=
1.5-0.03=
6.3+2.8÷7=
2.1×0.8=
2.5÷0.5=
8.08÷0.4=
5.8×0.3÷5.8=
7.5÷15=
0.2×3.3=
5.25÷2.5=
1.2-2.4÷2=
2÷5=
0.9÷0.3=
3.6+3.04=
4.8÷(0.5×2)=
1.8+0.3=
2.1
5-0.6=
4.4
1.4+0.86=
2.26
66.6-0.1-49.9=
16.6
4.8-3.7=
1.1
9.2+0.8=
10
3.8÷0.19=
20
8.6÷2÷4.3=
1
8.8÷1.1=
8
3.6×0.5=
1.8
7×0.14=
0.98
0.72÷80×100=
0.9
1.6×0.7=
1.12
2.4÷0.04=
60
15×0.02=
0.3
2.5×0.9×0.4=
0.9
99÷0.99=
100
0.15×100=
15
1.5-0.03=
1.47
6.3+2.8÷7=
6.7
2.1×0.8=
1.68
2.5÷0.5=
5
8.08÷0.4=
20.2
5.8×0.3÷5.8=
0.3
7.5÷15=
0.5
0.2×3.3=
0.66
5.25÷2.5=
2.1
1.2-2.4÷2=
0
2÷5=
0.4
0.9÷0.3=
3
3.6+3.04=
6.64
4.8÷(0.5×2)=
4.8
答案
1. 2.1 4.4 2.26 16.6 1.1 10 20 1 8 1.8 0.98 0.9 1.12 60 0.3 0.9 100 15 1.47 6.7 1.68 5 20.2 0.3 0.5 0.66 2.1 0 0.4 3 6.64 4.8
2. 计算下面各题,能简算的要简算。
3.87+12.5×4.2-0.8
(2.5+12.5)×4×8
7.2÷0.25+2.8×4
2.8×10.1
15.6-(3.18+3.6)-2.82
0.7×[(2.05-0.85)÷0.15]
3.87+12.5×4.2-0.8
(2.5+12.5)×4×8
7.2÷0.25+2.8×4
2.8×10.1
15.6-(3.18+3.6)-2.82
0.7×[(2.05-0.85)÷0.15]
答案
2. 55.57 480 40 28.28 6 5.6
解析
3.87+12.5×4.2-0.8
=3.87+52.5-0.8
=56.37-0.8
=55.57
(2.5+12.5)×4×8
=15×4×8
=60×8
=480
7.2÷0.25+2.8×4
=7.2×4+2.8×4
=(7.2+2.8)×4
=10×4
=40
2.8×10.1
=2.8×(10+0.1)
=2.8×10+2.8×0.1
=28+0.28
=28.28
15.6-(3.18+3.6)-2.82
=15.6-3.18-3.6-2.82
=(15.6-3.6)-(3.18+2.82)
=12-6
=6
0.7×[(2.05-0.85)÷0.15]
=0.7×[1.2÷0.15]
=0.7×8
=5.6
=3.87+52.5-0.8
=56.37-0.8
=55.57
(2.5+12.5)×4×8
=15×4×8
=60×8
=480
7.2÷0.25+2.8×4
=7.2×4+2.8×4
=(7.2+2.8)×4
=10×4
=40
2.8×10.1
=2.8×(10+0.1)
=2.8×10+2.8×0.1
=28+0.28
=28.28
15.6-(3.18+3.6)-2.82
=15.6-3.18-3.6-2.82
=(15.6-3.6)-(3.18+2.82)
=12-6
=6
0.7×[(2.05-0.85)÷0.15]
=0.7×[1.2÷0.15]
=0.7×8
=5.6
用$\boxed{3}$、$\boxed{2}$、$\boxed{0}和\boxed{\bullet }$四张卡片(都用上)可以摆出多少个不同的两位小数？这些数的平均数是多少？
答案
可以摆出 6 个不同的两位小数。(0.23+0.32+2.03+2.30+3.02+3.20)÷6=1.85
