8×(5×7)=(8×5)×7應用了乘法結(jié)合律。
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科目:小學數(shù)學 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=
5.1
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
      6.7+3.4=
10.1
10.1
   2.01×0.4=
0.804
0.804
   
6
13
+
7
13
=
1
1

(5)3.99+5.2=
9.19
9.19
   23+6.68=
29.68
29.68
   7×0.08=
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
   0.72÷6=
0.12
0.12
   3.9÷1.3=
3
3

(7)0.8×0.8=
0.64
0.64
   5.88+3.12=
9
9
   1.9+2.1=
4
4
   26÷2.6=
10
10
  
(8)340÷17=
20
20
   9.3÷0.3=
31
31
  13×4=
52
52
   3.6×5=
18
18

(9)1.5×4=
6
6
   20×16=
320
320
   28×3=
84
84
   3.2÷4=
0.8
0.8
 
(10)0.28×100=
28
28
   3200÷1000=
3.2
3.2
   0.5×100=
50
50
   4×0.125=
0.5
0.5

(11)340+120=
460
460
    
1
4
+
1
2
=
3
4
3
4
   2.5÷5=
0.5
0.5
   4.95×10=
49.5
49.5
   
(12)12-
1
2
-
1
2
=
11
11
   1÷0.25=
4
4
  5×0.13=
0.65
0.65
   12×0.05=
0.6
0.6

(13)3.08÷0.1=
30.8
30.8
   0.35×6=
2.1
2.1
   25÷0.5=
50
50
   1.5×3=
4.5
4.5

(14)4.3-2.7=
1.6
1.6
   8.1÷0.9=
9
9
   12÷1.2=
10
10
   0.48÷6=
0.08
0.08

(15)2.6÷26=
0.1
0.1
  0.72×5=
3.6
3.6
     4.8+3.2=
8
8
   5.7÷0.3=
19
19

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科目:小學數(shù)學 來源: 題型:

3.2×0.2= 1.4×0.4= 3.3÷3= 1.2÷0.3= 0.56÷8=
2.5×0.4= 1.5×2= 0.7×7= 7.3+0.3= 1.23×3=
0.53-0.3= 1.8×0.5= 0.9×0.01= 0.23×3= 1.6÷0.04=
2-1.2= 7.8÷6= 8.4÷0.21= 8.4÷0.7= 1.23×3=
5.6+3.6= 9-2.35= 0.56÷8= 7.3+2.7= 4.8÷1.2=
5.6÷0.4= 4.5÷0.9= 8.1×2= 90÷3= 7.2÷0.9=
1.23+3= 5.6+1.23= 4.5×2= 5.6÷1.4= 6.6÷1.1=
2.1÷3= 0.6×0.5= 3.23×2= 1.8÷3= 7.2÷6=
12.5÷0.1= 0.32÷0.8= 1.6+3.7= 0.45×0.2= 4.8÷0.08=
0.36÷1.8= 0.4×0.5= 8.4+5.6= 8.4÷2.1= 1.8×0.4=
0.01×8= 7.31×100= 0.09×6= 0.8×0.6= 3+2.3=
1.25×8= 3÷5= 2.3+2.3= 6.23+3.6= 9.3÷3=
4.8÷0.8= 7.5-4.5= 5.7+4.3= 0.75÷15= 1÷0.25=
1.2×60= 6÷0.2= 0.21×4= 0.25×4×9= 2.33×1.2=
0.62÷0.62-1= 5+3.2÷0.8= 7.5÷2.5×0= 3.9×0.01= 0.001+10.099=
3-0.98= 6×0.25= 0.63÷0.9= 8.95÷0.895=

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科目:小學數(shù)學 來源: 題型:

計算下面各題,能簡算的要簡算.
(1)25×32×1.25
(2)
7
13
×
2
17
+
6
13
÷
17
2

(3)
2
3
÷(1-
5
8

(4)
1
2
+
1
3
-
1
2
+
1
3

(5)1.8×(5.7-3.44÷0.8)
(6)0.3×2÷0.3×2.

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科目:小學數(shù)學 來源: 題型:

計算下面各題.
(1)75+25×12=
(2)64×128÷(32×64)=
(3)72×(
1
3
-
1
2
+
3
4
)=
(4)
1
4
÷(11-
8
13
-
5
13
)=
(5)23×
13
24
+
13
24
=
(6)2.2-8÷11-
2
11
×7=
(7)10
1
2
+(8
1
2
-5
3
7
 )=
(8)8
5
6
-(7
5
6
-3
1
6
)=
(9)(
5
7
+
1
15
)×7+
8
15
=
(10)1
1
5
×85+120%×7+1.2×8=
(11)20÷[
4
7
×(
1
2
-
3
8
)]=
(12)1
17
52
×(5.8-4.4×2)×(0.7-
3
5
)=
(13)(2.5×4.8)×
1
2
÷(2.4×2
1
2
)=
(14)15
3
4
÷1-(5
3
4
÷5.75)×4=
(15)3333×6666+9999×7778= (16)357×256256-356×255255
(17)1
1
2000
+2
2
2000
+3
3
2000
+…1999
1999
2000
=
(18)
5
27
×
3
8
+
7
27
×
5
15
+
5
24
×
4
27
=
(19)
2
3
+
2
9
+
2
27
+
2
81
+
2
243
=
(20)1
1
3
-
7
12
+
9
20
-
11
30
+
13
42
-
15
56
=

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科目:小學數(shù)學 來源: 題型:

我算得又快又巧.
8÷8=
14+6= 6×4= 42÷7= 8×8=
6×5= 32÷8= 3×7= 16÷8= 45÷9=
6×8= 81÷9= 12÷3+54= 60-14-32= 6×1×7=
3×6÷2= 46+11-11= 9×4+9= 7×5+7= 5×2+5=
8×8+8= 4×3+3=

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