1. 直接写出得数。
12÷1.5=
5.4÷18=
0.9×0.11=
10÷8−0.3=
0.6÷12=
0.41×0.7=
43.2÷6=
5.3×0.4×25=
6.28×0.5=
12.04−3.78=
4.8×0.3=
6.28÷3.14+3.14=
4.4×3=
2.17÷0.7=
13.54−8.94=
17.8−8.9−7.8=
12.5÷5=
4.41÷3=
1.8÷0.02=
0.9×0.5+0.5=
7.92−5.37=
66÷0.6=
4×31.4=
6.8+2.4÷3=
2.3×0.6=
3.52+4.58=
1.57+2.99=
3.14×10÷0.2=
9.85+3.59=
1.4×20=
3.14×11=
3.14×(100÷2)²=
12÷1.5=
5.4÷18=
0.9×0.11=
10÷8−0.3=
0.6÷12=
0.41×0.7=
43.2÷6=
5.3×0.4×25=
6.28×0.5=
12.04−3.78=
4.8×0.3=
6.28÷3.14+3.14=
4.4×3=
2.17÷0.7=
13.54−8.94=
17.8−8.9−7.8=
12.5÷5=
4.41÷3=
1.8÷0.02=
0.9×0.5+0.5=
7.92−5.37=
66÷0.6=
4×31.4=
6.8+2.4÷3=
2.3×0.6=
3.52+4.58=
1.57+2.99=
3.14×10÷0.2=
9.85+3.59=
1.4×20=
3.14×11=
3.14×(100÷2)²=
答案
1. 8
0.3
0.099
0.95
0.05
0.287
7.2
53
3.14
8.26
1.44
5.14
13.2
3.1
4.6
1.1
2.5
1.47
90
0.95
2.55
110
125.6
7.6
1.38
8.1
4.56
157
13.44
28
34.54
7850
0.3
0.099
0.95
0.05
0.287
7.2
53
3.14
8.26
1.44
5.14
13.2
3.1
4.6
1.1
2.5
1.47
90
0.95
2.55
110
125.6
7.6
1.38
8.1
4.56
157
13.44
28
34.54
7850
2. 计算下面各题,怎样算简便就怎样算。
$4.8×(\dfrac{5}{6}+\dfrac{1}{4}-\dfrac{7}{8})$
$9÷(\dfrac{11}{18}-\dfrac{2}{9}×2)÷3$
$4.2÷(1.7-2.5×0.4)$
$10.1×6.6-0.66$
$8.5×3÷(2.8-1.1)$
$\dfrac{7}{8}÷[\dfrac{15}{4}×(\dfrac{9}{20}-\dfrac{1}{5})]$
$4.8×(\dfrac{5}{6}+\dfrac{1}{4}-\dfrac{7}{8})$
$9÷(\dfrac{11}{18}-\dfrac{2}{9}×2)÷3$
$4.2÷(1.7-2.5×0.4)$
$10.1×6.6-0.66$
$8.5×3÷(2.8-1.1)$
$\dfrac{7}{8}÷[\dfrac{15}{4}×(\dfrac{9}{20}-\dfrac{1}{5})]$
答案
2. 1
18
6
66
15
$\dfrac{14}{15}$
18
6
66
15
$\dfrac{14}{15}$
3. 求下面图形涂色部分的周长和面积。
(1)
(2)
(3)
(1)
(2)
(3)
答案
3.(1)周长: 3.14×16÷2+3.14×8÷2+16−8=45.68(cm)
面积:3.14×(16÷2)²÷2−3.14×(8÷2)²÷2=75.36(cm²)
(2)周长:2×3.14×1.5+2×3.14×1.5÷2+1.5×8=26.13(m)
面积:(1.5×3)×(1.5×2)−3.14×1.5²−3.14×1.5²÷2=2.9025(m²)
(3)周长:3.14×2÷2+2×3.14×2÷4+2=8.28(dm)
面积:3.14×2²÷4−3.14×(2÷2)²÷2=1.57(dm²)
面积:3.14×(16÷2)²÷2−3.14×(8÷2)²÷2=75.36(cm²)
(2)周长:2×3.14×1.5+2×3.14×1.5÷2+1.5×8=26.13(m)
面积:(1.5×3)×(1.5×2)−3.14×1.5²−3.14×1.5²÷2=2.9025(m²)
(3)周长:3.14×2÷2+2×3.14×2÷4+2=8.28(dm)
面积:3.14×2²÷4−3.14×(2÷2)²÷2=1.57(dm²)
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