11.4-(8.4+0.25÷25%)

解:11.4-(8.4+0.25÷25%),
=11.4-(8.4+0.25÷0.25),
=11.4-8.4-1,
=3-1,
=2.
分析:把25%化為小數(shù),0.25÷0.25=1,然后運(yùn)用減法的性質(zhì)進(jìn)行簡算,得出結(jié)果.
點(diǎn)評(píng):此題考查了學(xué)生對(duì)數(shù)字的轉(zhuǎn)化方法,以及運(yùn)用所學(xué)知識(shí)簡算的能力.
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科目:小學(xué)數(shù)學(xué) 來源: 題型:

口算
(1)70×80=
5600
5600
        3.7×0.5=
1.85
1.85
     3.2×100=
320
320
      8.9-3.8=
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5.1

(2)3.8+2.5+6.2=
12.5
12.5
    12-6.2-3.8=
2
2
   1.7+0.43+3.3=
5.43
5.43
    3.4-1.5-0.5=
1.4
1.4

(3)
8
9
+
1
9
--
2
7
=
5
7
5
7
     1.4×5=
7
7
    650-470=
180
180
    79+2.1=
81.1
81.1
    
(4)3.14×3=
9.42
9.42
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10.1
10.1
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0.804
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6
13
+
7
13
=
1
1

(5)3.99+5.2=
9.19
9.19
   23+6.68=
29.68
29.68
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0.56
0.56
    0.25×0.4=
0.1
0.1

(6)22×0.2=
4.4
4.4
   99.9+1=
100.9
100.9
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0.12
0.12
   3.9÷1.3=
3
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(7)0.8×0.8=
0.64
0.64
   5.88+3.12=
9
9
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4
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
   3.2÷4=
0.8
0.8
 
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28
28
   3200÷1000=
3.2
3.2
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50
50
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0.5

(11)340+120=
460
460
    
1
4
+
1
2
=
3
4
3
4
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0.5
0.5
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1
2
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1
2
=
11
11
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4
4
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0.65
0.65
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0.6
0.6

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30.8
30.8
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2.1
2.1
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50
50
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4.5
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1.6
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9
9
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10
10
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