1.4÷0.3=14÷3=4…2
錯(cuò)誤
分析:在計(jì)算有余數(shù)的除法時(shí),往往根據(jù)商不變的規(guī)律把對(duì)應(yīng)被除數(shù)與除數(shù)縮小或擴(kuò)大相同的倍數(shù),商不變,但余數(shù)相對(duì)應(yīng)的縮小或擴(kuò)大對(duì)應(yīng)的倍數(shù),要想得到原來(lái)的余數(shù),只要對(duì)應(yīng)擴(kuò)大或縮小相同的倍數(shù)即可,由此規(guī)律解答即可.
點(diǎn)評(píng):此題主要利用有余數(shù)的除法中,被除數(shù)與除數(shù)縮小或擴(kuò)大相同的倍數(shù),商不變,余數(shù)相對(duì)應(yīng)的縮小或擴(kuò)大對(duì)應(yīng)的倍數(shù),掌握這一規(guī)律,靈活解答問(wèn)題.
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科目:小學(xué)數(shù)學(xué) 來(lái)源: 題型:

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(1)70×80=
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5600
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1.85
1.85
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320
320
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12.5
    12-6.2-3.8=
2
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   1.7+0.43+3.3=
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5.43
    3.4-1.5-0.5=
1.4
1.4

(3)
8
9
+
1
9
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2
7
=
5
7
5
7
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7
7
    650-470=
180
180
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81.1
81.1
    
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10.1
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13
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7
13
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1
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(5)3.99+5.2=
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9.19
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29.68
29.68
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0.56
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0.1
0.1

(6)22×0.2=
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4.4
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100.9
100.9
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0.12
0.12
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3
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(7)0.8×0.8=
0.64
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9
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4
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10
10
  
(8)340÷17=
20
20
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31
31
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52
52
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18
18

(9)1.5×4=
6
6
   20×16=
320
320
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84
84
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0.8
0.8
 
(10)0.28×100=
28
28
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3.2
3.2
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50
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(11)340+120=
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1
4
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3
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1
2
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11
11
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4
4
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0.65
0.65
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0.6
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30.8
30.8
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2.1
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10
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