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一、口算。
$0.85 + 0.25 = $
$2.8÷14 = $
$0.35×80 = $
$0.32÷16 = $
$10÷0.05 = $
$0.96÷0.6 = $
$2.05×4 = $
$0.65×4 = $
$0.85 + 0.25 = $
1.1
$0.6×0.6 = $0.36
$5.4÷0.9 = $6
$2.8÷14 = $
0.2
$5.1 - 2.4 = $2.7
$0.07×700 = $49
$0.35×80 = $
28
$5.24 + 3.76 = $9
$0.5×2.4 = $1.2
$0.32÷16 = $
0.02
$5.3 - 0.35 = $4.95
$1.5×0.8 = $1.2
$10÷0.05 = $
200
$2.6×0.5 = $1.3
$24.06 + 0.4 = $24.46
$0.96÷0.6 = $
1.6
$0.37×20 = $7.4
$3.15÷1.5 = $2.1
$2.05×4 = $
8.2
$1.75 + 25 = $26.75
$1.5÷0.15 = $10
$0.65×4 = $
2.6
$21.5 + 9.5 = $31
$2.9×0.2 = $0.58
答案
一、1.1 0.36 6
0.2 2.7 49
28 9 1.2
0.02 4.95 1.2
200 1.3 24.46
1.6 7.4 2.1
8.2 26.75 10
2.6 31 0.58
0.2 2.7 49
28 9 1.2
0.02 4.95 1.2
200 1.3 24.46
1.6 7.4 2.1
8.2 26.75 10
2.6 31 0.58
二、计算下面各题,怎样简便就怎样计算。
$1.49×3.6÷2.4$ $3.8×6.2÷3.1 + 9.43$ $17.25 - 0.68 - 6.25 - 0.32$
$0.78×199$ $9.6÷0.6 + 9.6÷0.4$ $2.7×[(2.3 + 1.15)÷0.5]$
$1.49×3.6÷2.4$ $3.8×6.2÷3.1 + 9.43$ $17.25 - 0.68 - 6.25 - 0.32$
$0.78×199$ $9.6÷0.6 + 9.6÷0.4$ $2.7×[(2.3 + 1.15)÷0.5]$
答案
1. $1.49×3.6÷2.4$
解：
$1.49×(3.6÷2.4)$
$=1.49×1.5$
$=2.235$
2. $3.8×6.2÷3.1 + 9.43$
解：
$3.8×(6.2÷3.1)+9.43$
$=3.8×2 + 9.43$
$=7.6+9.43$
$=17.03$
3. $17.25 - 0.68 - 6.25 - 0.32$
解：
$(17.25 - 6.25)-(0.68 + 0.32)$
$=11 - 1$
$=10$
4. $0.78×199$
解：
$0.78×(200 - 1)$
$=0.78×200-0.78×1$
$=156 - 0.78$
$=155.22$
5. $9.6÷0.6 + 9.6÷0.4$
解：
$16+24$
$=40$
6. $2.7×[(2.3 + 1.15)÷0.5]$
解：
$2.7×[3.45÷0.5]$
$=2.7×6.9$
$=18.63$
解：
$1.49×(3.6÷2.4)$
$=1.49×1.5$
$=2.235$
2. $3.8×6.2÷3.1 + 9.43$
解：
$3.8×(6.2÷3.1)+9.43$
$=3.8×2 + 9.43$
$=7.6+9.43$
$=17.03$
3. $17.25 - 0.68 - 6.25 - 0.32$
解：
$(17.25 - 6.25)-(0.68 + 0.32)$
$=11 - 1$
$=10$
4. $0.78×199$
解：
$0.78×(200 - 1)$
$=0.78×200-0.78×1$
$=156 - 0.78$
$=155.22$
5. $9.6÷0.6 + 9.6÷0.4$
解：
$16+24$
$=40$
6. $2.7×[(2.3 + 1.15)÷0.5]$
解：
$2.7×[3.45÷0.5]$
$=2.7×6.9$
$=18.63$
