1
12
+
1
4
=
1
3
1
3

3.5+6
1
2
=
10
10

2-
6
7
=
1
1
7
1
1
7

4
5
-
8
15
=
4
15
4
15

1
4
-
1
5
=
1
20
1
20

1
2
-
2
5
=
1
10
1
10

0.2-
1
6
=
1
30
1
30

0.3+
1
3
=
19
30
19
30

3
4
×4=
3
3

5
6
×
8
15
=
4
9
4
9

3
16
×
4
9
1
12
1
12

15×1
2
3
=
25
25

7
24
×
3
4
=
7
32
7
32

3
5
=
0
0

24÷
3
4
=
32
32

2
5
÷
1
2
=
4
5
4
5

5
18
÷1
2
3
=
1
6
1
6

8
9
÷
3
8
=
2
10
27
2
10
27

5
8
÷
2
3
=
15
16
15
16

9+
2
9
=
9
2
9
9
2
9

12π=
37.68
37.68

0.4×3.14=
1.256
1.256

0.92=
0.81
0.81

2.5×3.4=
8.5
8.5

28÷
2
3
=
42
42
分析:利用分數(shù)的四則混合運算順序進行計算,計算中適時的利用小數(shù)和分數(shù)的互化.
解答:解:
1
12
+
1
4
=
1
3
     3.5+6
1
2
=10      2-
6
7
=1
1
7
        
4
5
-
8
15
=
4
15
      
1
4
-
1
5
=
1
20

1
2
-
2
5
=
1
10
         0.2-
1
6
=
1
30
      0.3+
1
3
=
19
30
      
3
4
×4=3         
5
6
×
8
15
=
4
9

3
16
×
4
9
1
12
      15×1
2
3
=25      
7
24
×
3
4
=
7
32
      0÷
3
5
=0         24÷
3
4
=32
2
5
÷
1
2
=
4
5
       
5
18
÷1
2
3
=
1
6
      
8
9
÷
3
8
=2
10
27
     
5
8
÷
2
3
=
15
16
        9+
2
9
=9
2
9

12π=37.68     0.4×3.14=1.256     0.92=0.81      2.5×3.4=8.5       28÷
2
3
=42.
點評:此題考查了按分數(shù)的四則混合運算順序進行計算.
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(114)0.4×6.3×25(115)(4.9+4.9+…+4.9)×2.5(16個4.9相加)(116)7.5×199(117)(數(shù)學公式+數(shù)學公式)×36
(118)1.2×5.7-1.2+5.3×1.2(119)0.825×102-82.5(120)46×數(shù)學公式(121)560÷16÷5
(122)3÷2.5(123)84+(54-16)(124)數(shù)學公式+數(shù)學公式+數(shù)學公式+數(shù)學公式(125)數(shù)學公式-(數(shù)學公式÷數(shù)學公式+數(shù)學公式
(126)3×(數(shù)學公式+數(shù)學公式)+數(shù)學公式(127)7.2÷(5-0.75+0.25)(128)725÷25+275÷25(129)數(shù)學公式×數(shù)學公式×數(shù)學公式
(130)數(shù)學公式×45-數(shù)學公式÷數(shù)學公式(131)48×(數(shù)學公式-數(shù)學公式(132)數(shù)學公式×數(shù)學公式+數(shù)學公式×數(shù)學公式(133)(32+數(shù)學公式)÷4
(134)數(shù)學公式÷數(shù)學公式÷數(shù)學公式(135)46×數(shù)學公式(136)數(shù)學公式×數(shù)學公式+數(shù)學公式÷9

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