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1. 直接写出得数。(20☆)
$3.9÷13= $
$52÷0.1= $
$0.4×3= $
$7.44×0= $
$12.3÷41= $
$13×0.7= $
$0.7×20= $
$0.56×3= $
$36÷0.2= $
$0.49÷0.7= $
$1.3×0.05= $
$4.7×10= $
$0.45×0.6= $
$0.64×0.3= $
$3.6×0.2= $
$12.5×8= $
$4.9÷0.1= $
$3.3÷0.11= $
$0.01×102= $
$0.05×18= $
$6.3÷0.21= $
$7.8÷0.2= $
$0.5×80= $
$4.5×2= $
$0.6×17= $
$2.4÷4= $
$0.4×2.9= $
$4.5×0.3= $
$4.22×0.7= $
$8×0.25= $
$0.9×0.8= $
$3.4÷0.2= $
$8×0.54= $
$7.5×0.5= $
$0.05×7= $
$4.3×2= $
$3.46÷0.02= $
$3.4×0.8= $
$0.15×0.4= $
$7.31×0.4= $
$3.9÷13= $
0.3
$52÷0.1= $
520
$0.4×3= $
1.2
$7.44×0= $
0
$12.3÷41= $
0.3
$13×0.7= $
9.1
$0.7×20= $
14
$0.56×3= $
1.68
$36÷0.2= $
180
$0.49÷0.7= $
0.7
$1.3×0.05= $
0.065
$4.7×10= $
47
$0.45×0.6= $
0.27
$0.64×0.3= $
0.192
$3.6×0.2= $
0.72
$12.5×8= $
100
$4.9÷0.1= $
49
$3.3÷0.11= $
30
$0.01×102= $
1.02
$0.05×18= $
0.9
$6.3÷0.21= $
30
$7.8÷0.2= $
39
$0.5×80= $
40
$4.5×2= $
9
$0.6×17= $
10.2
$2.4÷4= $
0.6
$0.4×2.9= $
1.16
$4.5×0.3= $
1.35
$4.22×0.7= $
2.954
$8×0.25= $
2
$0.9×0.8= $
0.72
$3.4÷0.2= $
17
$8×0.54= $
4.32
$7.5×0.5= $
3.75
$0.05×7= $
0.35
$4.3×2= $
8.6
$3.46÷0.02= $
173
$3.4×0.8= $
2.72
$0.15×0.4= $
0.06
$7.31×0.4= $
2.924
答案
0.3 520 1.2 0
0.3 9.1 14 1.68
180 0.7 0.065 47
0.27 0.192 0.72 100
49 30 1.02 0.9
30 39 40 9
10.2 0.6 1.16 1.35
2.954 2 0.72 17
4.32 3.75 0.35 8.6
173 2.72 0.06 2.924
0.3 9.1 14 1.68
180 0.7 0.065 47
0.27 0.192 0.72 100
49 30 1.02 0.9
30 39 40 9
10.2 0.6 1.16 1.35
2.954 2 0.72 17
4.32 3.75 0.35 8.6
173 2.72 0.06 2.924
2. 计算下面平行四边形的面积。(单位:cm)(12☆)
(1)
(1)
208cm²
(2)250cm²
(3)30cm²
答案
(1)$208cm^{2}$ (2)$250cm^{2}$ (3)$30cm^{2}$
3. 按规律写得数。(9☆)
$81÷9= 9$
$88.2÷9= 9.8$
$88.83÷9= 9.87$
$88.884÷9= $
$88.8885÷9= $
$88.88886÷9= $
$81÷9= 9$
$88.2÷9= 9.8$
$88.83÷9= 9.87$
$88.884÷9= $
9.876
$88.8885÷9= $
9.8765
$88.88886÷9= $
9.87654
答案
9.876 9.8765 9.87654
4. 计算下面各题,能简算的要简算。(9☆)
$2.4÷1.5+3.6÷1.5$
$22.05×0.7÷2.1+0.8$
$0.25×0.8×0.125×40$
$2.4÷1.5+3.6÷1.5$
$22.05×0.7÷2.1+0.8$
$0.25×0.8×0.125×40$
答案
4 8.15 1
