簡便計算

2021-03-04 09:01:04 字數 10043 閱讀 1029

1樓:匿名使用者

(15分之8+20分之9×3分之2)÷12分之1 =(15分之8+10分之3)÷12分之1 =(30分之16+30分之9)÷12分之1 =6分之5÷12分之1 =10

(3.2+0.56)÷0.8簡便運算怎麼算?

2樓:簡胖子我也

(3.2+0.56)÷0.8

=3.2÷0.8+0.56÷0.8

=4+0.7

=4.7

簡便計算是一種特殊的計算,它運用了運算定律與數字的基本性質,從而使計算簡便,使乙個很複雜的式子變得很容易計算出得數。

在數的運算中,有加(+)、減(-)、乘(×)、除(÷)四種運算,我們在數學上又為了能更 簡便計算它們,簡稱稱作簡算,簡算有以下幾種公式:

加法:a+b=b+a( 加法交換律)

a+b+c=a+(b+c)( 加法結合律)

乘法:a×b=b×a( 乘法交換律)

a×b×c=a×(b×c)( 乘法結合律)

(a+b)×c=a×c+b×c或(a-b)×c=a×c-b×c( 乘法分配律)

減法:a-b-c=a-(b+c)(減法的基本性質)

除法:a÷b÷c=a÷(b×c)(除法的基本性質)

重疊數字多位數:abab=ab×101

(a+b)÷c=(a÷c)+(b÷c)或(a-b)÷c=a÷c-b÷c(除法分配律)注意除法分配率只有在 被除數是兩個數的差或和的 情況下才能進行 分配。

五年級下冊簡便運算和脫式計算

3樓:匿名使用者

第一單元:

一、 口算題( 12分 )

4.4÷11= 0.3×0.3= 0÷730= 0.03×10-0.1=

7÷5= 0.25÷0.5= 0.53×7= 125×0.5×0.8=

1.9×0.5= 29×5= 2.3×0.8= 0.2×7.6×50=

二、 簡算題( 6分 )

9.9×8.6+0.86

三、 計算題(每道小題 6分 共 12分 )

1. 3-7.14÷3.5×1.05

2. [20-(90.75÷6.6+2.25)]×11.6

一、 口算題( 12分 )

0.1×208= 7.2÷36= 4.8÷16=

1.3×50= 0.5×20= 0.81÷0.09=

4.2÷4= 0.98÷7= 0.39÷1.3=

2.5×40= 4.7×2= 0.4×0.5=

二、 簡算題( 6分 )

0.46×7.5+0.46×2.5

三、 計算題(每道小題 6分 共 12分 )

1. 1.08÷(3.94+34.3×0.2)-0.08

2. 4.8×(11.03-15.6÷7.5)

4樓:我非少年

1.120-36×4÷18+35

2.(58+37)÷(64-9×5)

3.(6.8-6.8×0.55)÷8.5

4.0.12× 4.8÷0.12×4.8

5.(3.2×1.5+2.5)÷1.6 (2)3.2×(1.5+2.5)÷1.6

6.6-1.6÷4= 5.38+7.85-5.37=

7.7.2÷0.8-1.2×5= 6-1.19×3-0.43=

8.6.5×(4.8-1.2×4)= 0.68×1.9+0.32×1.9

9.10.15-10.75×0.4-5.7

10.5.8×(3.87-0.13)+4.2×3.74

11.32.52-(6+9.728÷3.2)×2.5

12. 6 ×( 1/2 + 2/3 )

13. 8 × 4/5 + 8 × 11/5

14. 31 × 5/6 – 5/6

15. 9/7 - ( 2/7 – 10/21 )

16. 5/9 × 18 – 14 × 2/7

17. 4/5 × 25/16 + 2/3 × 3/4

18. 14 × 8/7 – 5/6 × 12/15

19. 17/32 – 3/4 × 9/24

20. 3 × 2/9 + 1/3

21. 5/7 × 3/25 + 3/7

22. 3/14 ×× 2/3 + 1/6

23. 1/5 × 2/3 + 5/6

24. 9/22 + 1/11 ÷ 1/2

25. 5/3 × 11/5 + 4/3

26. 45 × 2/3 + 1/3 × 15

27. 7/19 + 12/19 × 5/6

28. 1/4 + 3/4 ÷ 2/3

29. 8/7 × 21/16 + 1/2

30. 101 × 1/5 – 1/5 × 21

31.[-|98|+76+(-87)]*23[56+(-75)-(7)]-(8+4+3)

32.5+21*8/2-6-59

33.68/21-8-11*8+61

34.-2/9-7/9-56

35.4.6-(-3/4+1.6-4-3/4)

36.1/2+3+5/6-7/12

37.[2/3-4-1/4*(-0.4)]/1/3+2

38.22+(-4)+(-2)+4*3

39.-2*8-8*1/2+8/1/8

40.(2/3+1/2)/(-1/12)*(-12)

41.(-28)/(-6+4)+(-1)

42.2/(-2)+0/7-(-8)*(-2)

43.(1/4-5/6+1/3+2/3)/1/2

44.18-6/(-3)*(-2)

45.(5+3/8*8/30/(-2)-3

46.(-84)/2*(-3)/(-6)

47.1/2*(-4/15)/2/3

48.-3x+2y-5x-7y

49.2/3÷1/2-1/4×2/5

50. 2-6/13÷9/26-2/3

51.2/9+1/2÷4/5+3/8

52.10÷5/9+1/6×4

53.1/2×2/5+9/10÷9/20

54.5/9×3/10+2/7÷2/5

55.1/2+1/4×4/5-1/8

56.3/4×5/7×4/3-1/2

57.23-8/9×1/27÷1/27

58.8×5/6+2/5÷4

59.1/2+3/4×5/12×4/5

60.8/9×3/4-3/8÷3/4

61.5/8÷5/4+3/23÷9/11

62.3/7 × 49/9 - 4/3

63.8/9 × 15/36 + 1/27

64.12× 5/6 – 2/9 ×3

65.8× 5/4 + 1/4

66.6÷ 3/8 – 3/8 ÷6

67.4/7 × 5/9 + 3/7 × 5/9

68.5/2 -( 3/2 + 4/5 )

69.7/8 + ( 1/8 + 1/9 )

70.9 × 5/6 + 5/6

74.8 × 4/5 + 8 × 11/5

76.9/7 - ( 2/7 – 10/21 )

77.5/9 × 18 – 14 × 2/7

78.4/5 × 25/16 + 2/3 × 3/4

79.14 × 8/7 – 5/6 × 12/15

80.17/32 – 3/4 × 9/24

81.3 × 2/9 + 1/3

82.5/7 × 3/25 + 3/7

83.3/14 ×× 2/3 + 1/6

84.1/5 × 2/3 + 5/6

85.9/22 + 1/11 ÷ 1/2

86.5/3 × 11/5 + 4/3

87.45 × 2/3 + 1/3 × 15

88.7/19 + 12/19 × 5/6

89.1/4 + 3/4 ÷ 2/3

90.8/7 × 21/16 + 1/2

91.101 × 1/5 – 1/5 × 21

92.4.38 ÷ (36.94 + 34.3×0.2)

93.[(5.84 - 3.9 ) ÷0.4 + 0.15] ×0.92

94.[7.6 - 5 ×(0.3 + 0.9)]÷10

95.1.8×(1.4 - 0.26 ÷2)

96.0.27 ×99 + 0.27

97. 8 -0.8 ÷5 + 0.24 ×9

98. 0.25×1.25×40×8

99.(0.25 + 2.5 + 25)×0.4

100.8.4 + 7.66 + 2.34 +1.6

1. 3/7 × 49/9 - 4/3

2. 8/9 × 15/36 + 1/27

3. 12× 5/6 – 2/9 ×3

4. 8× 5/4 + 1/4

5. 6÷ 3/8 – 3/8 ÷6

6. 4/7 × 5/9 + 3/7 × 5/9

7. 5/2 -( 3/2 + 4/5 )

8. 7/8 + ( 1/8 + 1/9 )

9. 9 × 5/6 + 5/6

10. 3/4 × 8/9 - 1/3

11. 7 × 5/49 + 3/14

12. 6 ×( 1/2 + 2/3 )

13. 8 × 4/5 + 8 × 11/5

14. 31 × 5/6 – 5/6

15. 9/7 - ( 2/7 – 10/21 )

16. 5/9 × 18 – 14 × 2/7

17. 4/5 × 25/16 + 2/3 × 3/4

18. 14 × 8/7 – 5/6 × 12/15

19. 17/32 – 3/4 × 9/24

20. 3 × 2/9 + 1/3

21. 5/7 × 3/25 + 3/7

22. 3/14 ×× 2/3 + 1/6

23. 1/5 × 2/3 + 5/6

24. 9/22 + 1/11 ÷ 1/2

25. 5/3 × 11/5 + 4/3

26. 45 × 2/3 + 1/3 × 15

27. 7/19 + 12/19 × 5/6

28. 1/4 + 3/4 ÷ 2/3

29. 8/7 × 21/16 + 1/2

30. 101 × 1/5 – 1/5 × 21

31.[-|98|+76+(-87)]*23[56+(-75)-(7)]-(8+4+3)

32.5+21*8/2-6-59

33.68/21-8-11*8+61

34.-2/9-7/9-56

35.4.6-(-3/4+1.6-4-3/4)

36.1/2+3+5/6-7/12

37.[2/3-4-1/4*(-0.4)]/1/3+2

38.22+(-4)+(-2)+4*3

39.-2*8-8*1/2+8/1/8

40.(2/3+1/2)/(-1/12)*(-12)

41.(-28)/(-6+4)+(-1)

42.2/(-2)+0/7-(-8)*(-2)

43.(1/4-5/6+1/3+2/3)/1/2

44.18-6/(-3)*(-2)

45.(5+3/8*8/30/(-2)-3

46.(-84)/2*(-3)/(-6)

47.1/2*(-4/15)/2/3

48.-3x+2y-5x-7y

49.2/3÷1/2-1/4×2/5

50. 2-6/13÷9/26-2/3

51.2/9+1/2÷4/5+3/8

52.10÷5/9+1/6×4

53.1/2×2/5+9/10÷9/20

54.5/9×3/10+2/7÷2/5

55.1/2+1/4×4/5-1/8

56.3/4×5/7×4/3-1/2

57.23-8/9×1/27÷1/27

58.8×5/6+2/5÷4

59.1/2+3/4×5/12×4/5

60.8/9×3/4-3/8÷3/4

61.5/8÷5/4+3/23÷9/11

62.3/7 × 49/9 - 4/3

63.8/9 × 15/36 + 1/27

64.12× 5/6 – 2/9 ×3

65.8× 5/4 + 1/4

66.6÷ 3/8 – 3/8 ÷6

67.4/7 × 5/9 + 3/7 × 5/9

68.5/2 -( 3/2 + 4/5 )

69.7/8 + ( 1/8 + 1/9 )

70.9 × 5/6 + 5/6

74.8 × 4/5 + 8 × 11/5

76.9/7 - ( 2/7 – 10/21 )

77.5/9 × 18 – 14 × 2/7

78.4/5 × 25/16 + 2/3 × 3/4

79.14 × 8/7 – 5/6 × 12/15

80.17/32 – 3/4 × 9/24

81.3 × 2/9 + 1/3

82.5/7 × 3/25 + 3/7

83.3/14 ×× 2/3 + 1/6

84.1/5 × 2/3 + 5/6

85.9/22 + 1/11 ÷ 1/2

86.5/3 × 11/5 + 4/3

87.45 × 2/3 + 1/3 × 15

88.7/19 + 12/19 × 5/6

89.1/4 + 3/4 ÷ 2/3

90.8/7 × 21/16 + 1/2

91.101 × 1/5 – 1/5 × 21

92.4.38 ÷ (36.94 + 34.3×0.2)

93.[(5.84 - 3.9 ) ÷0.4 + 0.15] ×0.92

94.[7.6 - 5 ×(0.3 + 0.9)]÷10

95.1.8×(1.4 - 0.26 ÷2)

96.0.27 ×99 + 0.27

97. 8 -0.8 ÷5 + 0.24 ×9

98. 0.25×1.25×40×8

99.(0.25 + 2.5 + 25)×0.4

100.8.4 + 7.66 + 2.34 +1.6

1. 3/7 × 49/9 - 4/3

2. 8/9 × 15/36 + 1/27

3. 12× 5/6 – 2/9 ×3

4. 8× 5/4 + 1/4

5. 6÷ 3/8 – 3/8 ÷6

6. 4/7 × 5/9 + 3/7 × 5/9

7. 5/2 -( 3/2 + 4/5 )

8. 7/8 + ( 1/8 + 1/9 )

9. 9 × 5/6 + 5/6

10. 3/4 × 8/9 - 1/3

11. 7 × 5/49 + 3/14

12. 6 ×( 1/2 + 2/3 )

13. 8 × 4/5 + 8 × 11/5

14. 31 × 5/6 – 5/6

15. 9/7 - ( 2/7 – 10/21 )

16. 5/9 × 18 – 14 × 2/7

17. 4/5 × 25/16 + 2/3 × 3/4

18. 14 × 8/7 – 5/6 × 12/15

19. 17/32 – 3/4 × 9/24

20. 3 × 2/9 + 1/3

21. 5/7 × 3/25 + 3/7

22. 3/14 ×× 2/3 + 1/6

23. 1/5 × 2/3 + 5/6

24. 9/22 + 1/11 ÷ 1/2

25. 5/3 × 11/5 + 4/3

26. 45 × 2/3 + 1/3 × 15

27. 7/19 + 12/19 × 5/6

28. 1/4 + 3/4 ÷ 2/3

29. 8/7 × 21/16 + 1/2

30. 101 × 1/5 – 1/5 × 21

31.[-|98|+76+(-87)]*23[56+(-75)-(7)]-(8+4+3)

32.5+21*8/2-6-59

33.68/21-8-11*8+61

34.-2/9-7/9-56

35.4.6-(-3/4+1.6-4-3/4)

36.1/2+3+5/6-7/12

37.[2/3-4-1/4*(-0.4)]/1/3+2

38.22+(-4)+(-2)+4*3

39.-2*8-8*1/2+8/1/8

40.(2/3+1/2)/(-1/12)*(-12)

41.(-28)/(-6+4)+(-1)

42.2/(-2)+0/7-(-8)*(-2)

43.(1/4-5/6+1/3+2/3)/1/2

44.18-6/(-3)*(-2)

45.(5+3/8*8/30/(-2)-3

46.(-84)/2*(-3)/(-6)

47.1/2*(-4/15)/2/3

48.-3x+2y-5x-7y

49.2/3÷1/2-1/4×2/5

50. 2-6/13÷9/26-2/3

51.2/9+1/2÷4/5+3/8

52.10÷5/9+1/6×4

53.1/2×2/5+9/10÷9/20

54.5/9×3/10+2/7÷2/5

55.1/2+1/4×4/5-1/8

56.3/4×5/7×4/3-1/2

57.23-8/9×1/27÷1/27

58.8×5/6+2/5÷4

59.1/2+3/4×5/12×4/5

60.8/9×3/4-3/8÷3/4

61.5/8÷5/4+3/23÷9/11

62.3/7 × 49/9 - 4/3

63.8/9 × 15/36 + 1/27

64.12× 5/6 – 2/9 ×3

65.8× 5/4 + 1/4

66.6÷ 3/8 – 3/8 ÷6

67.4/7 × 5/9 + 3/7 × 5/9

68.5/2 -( 3/2 + 4/5 )

69.7/8 + ( 1/8 + 1/9 )

70.9 × 5/6 + 5/6

74.8 × 4/5 + 8 × 11/5

76.9/7 - ( 2/7 – 10/21 )

77.5/9 × 18 – 14 × 2/7

78.4/5 × 25/16 + 2/3 × 3/4

79.14 × 8/7 – 5/6 × 12/15

80.17/32 – 3/4 × 9/24

81.3 × 2/9 + 1/3

82.5/7 × 3/25 + 3/7

83.3/14 ×× 2/3 + 1/6

84.1/5 × 2/3 + 5/6

85.9/22 + 1/11 ÷ 1/2

86.5/3 × 11/5 + 4/3

87.45 × 2/3 + 1/3 × 15

88.7/19 + 12/19 × 5/6

89.1/4 + 3/4 ÷ 2/3

90.8/7 × 21/16 + 1/2

91.101 × 1/5 – 1/5 × 21

92.4.38 ÷ (36.94 + 34.3×0.2)

93.[(5.84 - 3.9 ) ÷0.4 + 0.15] ×0.92

94.[7.6 - 5 ×(0.3 + 0.9)]÷10

95.1.8×(1.4 - 0.26 ÷2)

96.0.27 ×99 + 0.27

97. 8 -0.8 ÷5 + 0.24 ×9

98. 0.25×1.25×40×8

99.(0.25 + 2.5 + 25)×0.4

100.8.4 + 7.66 + 2.34 +1.6

1.8又3分之5減去3又4分之1與1又10分之3的和,差是多少?

2.甲數是4又5分之1,比乙數的5倍少4/5,求乙數。

3.乙個數與4又2分之1的和比5.75多2又4分之1,求這個數。

希望對你有幫助!!!

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