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一、口算。
$6 - 2.8 =$
$0.83 + 0.38 =$
$50×(0.8 + 0.7) =$
$1.8×90 =$
$3.2÷0.8 =$
$125×0.08×0.3 =$
$0.91 - 0.76 =$
$0.74 + 0.58 =$
$8.01 + 0.89 + 1.99 =$
$48÷0.12 =$
$2.4×5 =$
$3 - 0.67 - 0.33 =$
$10.8÷1.8 =$
$0.43 - 0.3 =$
$(6.9 - 2.4)÷3 =$
$0.36×0.4 =$
$2.45÷0.7 =$
$3.6÷0.9 - 4 =$
$4.5 + 6.5 =$
$0.19 - 0.1 =$
$0.68 + 8×0.5 =$
$0.42÷0.6 =$
$1.3×0.6 =$
$3.6 + 4 - 3.8 =$
$6 - 2.8 =$
3.2
$0.83 + 0.38 =$
1.21
$50×(0.8 + 0.7) =$
75
$1.8×90 =$
162
$3.2÷0.8 =$
4
$125×0.08×0.3 =$
3
$0.91 - 0.76 =$
0.15
$0.74 + 0.58 =$
1.32
$8.01 + 0.89 + 1.99 =$
10.89
$48÷0.12 =$
400
$2.4×5 =$
12
$3 - 0.67 - 0.33 =$
2
$10.8÷1.8 =$
6
$0.43 - 0.3 =$
0.13
$(6.9 - 2.4)÷3 =$
1.5
$0.36×0.4 =$
0.144
$2.45÷0.7 =$
3.5
$3.6÷0.9 - 4 =$
0
$4.5 + 6.5 =$
11
$0.19 - 0.1 =$
0.09
$0.68 + 8×0.5 =$
4.68
$0.42÷0.6 =$
0.7
$1.3×0.6 =$
0.78
$3.6 + 4 - 3.8 =$
3.8
答案
一、3.2 1.21 75
162 4 3
0.15 1.32 10.89
400 12 2
6 0.13 1.5
0.144 3.5 0
11 0.09 4.68
162 4 3
0.15 1.32 10.89
400 12 2
6 0.13 1.5
0.144 3.5 0
11 0.09 4.68
二、计算下面各题，怎样简便就怎样计算。
$2.8×3.1 - 17.6÷8$
$6.33×101 - 6.33$
$2.72÷[(8.2 - 6.5)×0.5]$
$21.8 - 7.22 - 2.78 + 3.2$
$25.8 + 10.5÷(5 - 3.5)$
$2.8×3.1 - 17.6÷8$
$6.33×101 - 6.33$
$2.72÷[(8.2 - 6.5)×0.5]$
$21.8 - 7.22 - 2.78 + 3.2$
$25.8 + 10.5÷(5 - 3.5)$
答案
二、计算下面各题，怎样简便就怎样计算。
1. $2.8×3.1 - 17.6÷8$
$=8.68 - 2.2$
$=6.48$
2. $6.33×101 - 6.33$
$=6.33×(101 - 1)$
$=6.33×100$
$=633$
3. $2.72÷[(8.2 - 6.5)×0.5]$
$=2.72÷[1.7×0.5]$
$=2.72÷0.85$
$=3.2$
4. $21.8 - 7.22 - 2.78 + 3.2$
$=(21.8 + 3.2) - (7.22 + 2.78)$
$=25 - 10$
$=15$
5. $25.8 + 10.5÷(5 - 3.5)$
$=25.8 + 10.5÷1.5$
$=25.8 + 7$
$=32.8$
1. $2.8×3.1 - 17.6÷8$
$=8.68 - 2.2$
$=6.48$
2. $6.33×101 - 6.33$
$=6.33×(101 - 1)$
$=6.33×100$
$=633$
3. $2.72÷[(8.2 - 6.5)×0.5]$
$=2.72÷[1.7×0.5]$
$=2.72÷0.85$
$=3.2$
4. $21.8 - 7.22 - 2.78 + 3.2$
$=(21.8 + 3.2) - (7.22 + 2.78)$
$=25 - 10$
$=15$
5. $25.8 + 10.5÷(5 - 3.5)$
$=25.8 + 10.5÷1.5$
$=25.8 + 7$
$=32.8$
