1樓：瑞安丫
1. 0.4×125×25×0.8 =（0.4×25）×（125×0.8）=10×100=1000
2. 1.25×（8+10）=1.25×8+1.25×10 =10+12.5=22.5
3.9123-（123+8.8）=9123-123-8.8=9000-8.8=8991.2
4.1.24×8.3+8.3×1.76 =8.3×（1.24+1.76） =8.3×3=24.9
5.9999×1001
=9999×（1000+1）
=9999×1000+9999×1
=10008999
6. 14.8×6.3-6.3×6.5＋8.3×3.7
=（14.8-6.5）×6.3＋8.3×3.7
=8.3×6.3+8.3×3.7
=8.3×（6.3＋3.7）
=8.3×10
=837. 1.24+0.78+8.76
=（1.24+8.76）+0.78
=10+0.78
=10.78
8. 933-157-43 =933-（157+43） =933-200 =733
9. 4821-998
=4821-1000+22=3823
10. 32×125×25
=4×8×125×25
=（4×25）×（8×125）
=100×1000
=100000 9048÷26
=（2600+2600+2600+1248）÷26
=2600÷26+2600÷26+2600÷26+1248÷26
=100+100+100+48
=348
11. 2881÷ 43
=（1290+1591）÷ 43
=1290÷43+1591÷43
=30+37 =67 3.2×42.3×3.75-12.5×0.423×16
=3.2×42.3×3.75-1.25×42.3×1.6
=42.3×(3.2×3.75-1.25×1.6)
=42.3×(4×0.8×3.75-1.25×4×0.4)
=42.3×(4×0.4×2×3.75-1.25×4×0.4)
=42.3×(4x0.4x7.5-1.25x4x0.4)
=42.3×[4×0.4×(7.5-1.25)]
=42.3×[4×0.4×6.25]
=42.3×(4×2.5) =423
12. 1.8+18÷1.5-0.5×0.3 =1.8+12-0.15=13.8-0.15 =13.65
13. 6.5×8+3.
5×8-47 =52+28-47 =80-47 =33 (80-9.8)×5分之2-1.32 =70.
2x2/5-1.32=28.08-1.
32 =26.76
14. 8×7分之4÷[1÷(3.2-2.95)] =8×4/7÷[1÷0.25]=8×4/7÷4 =8/7
15. 2700×（506－499）÷900 =2700×7÷900 =18900÷900 =21
16. 33.02－（148.4－90.85）÷2.5=33.02－57.55÷2.3=33.02－23.02=10
17. （1÷1－1）÷5.1 =（1－1）÷5.1 =0÷5.1 =0
18. 18.1＋（3－0.299÷0.23）×1=18.1＋1.7×1 =18.1＋1.7 =19.8
19. 9000÷72×(1.25×0.7×8)=9000÷72×7=125×7=875
20. 61-(1.25+2.5×0.7)=61-3=58
21. [(10-0.8)+9.85]-2÷0.125=19.05-2÷0.125=19.05-16=13.05
22. 5.4÷1.8+240×1.5=3+360=363
23. 9000÷72×(1.25×0.7×8）=9000÷72×7=125×7=875
24. 61-(1.25+2.5×0.7)=61-3=58
25. [(10-0.8)+9.85]-2÷0.125=19.05-2÷0.125=19.05-16=3.05
26. 408－12×24= 408 - 288= 120
27. （46＋28）×60= 74 x 60= 4440
28. 42×50－17 = 2100- 17 = 2083
29. 32＋105÷5 = 32 + 21= 53
30. 420×（327－238） = 420 x 89 = 37380
31. (4121+2389)÷7 = 6510 ÷7 = 930
32. 3.416÷（0.016×35） = 3.416 ÷0.56 = 6.1
33. 0.8×[(10－6.76)÷1.2] = 0.8 x(3.24÷1.2) = 0.8 x 2.7 = 2.16
34. 5.67×0.2-0.62 = 1.134-0.62 = 0.514
35.0.4×0.7×0.25 = 0.4 x 0.2 5 x 0.7 = 0.1 x 0.7 = 0.07
36. 0.78+5.436+1 = 6.216 +1 = 7.216
37. 30.8÷[14－(9.85＋1.07)] = 30.8 ÷ (14 - 10.92) = 30.8÷3.08 = 10
38. [60－(9.5＋28.9)]÷0.18 = (60- 38.4)÷0.18 = 21.6 ÷0.18 = 120
39. 2.881÷0.43－0.24×3.5 = 6.7 - 0.24 x3.5 = 6.7 - 0.84 = 5.86
40. 20×[(2.44－1.
8)÷0.4＋0.15] = 20x (0.
64 ÷0.4 +0.15)= 20x(1.
6 +0.15) = 20 x1.75 = 35
41. 28-(3.4+1.25×2.4) = 28 - (3.4 + 3) = 28 - 6.4 = 21.6
42. 2.55×7.1+2.45×7.1 = (2.55 + 2.45) x7.1 = 5 x7.1=35.5
43. 0.8×〔15.5-(3.21+5.79)〕 = 0.8 x (15.5 - 9) = 0.8 x 6.5 = 5.2
44.（31.8+3.2×4）÷5 = (31.8 + 12.8)÷5 = 44.6÷5 = 8.92
45. 31.5×4÷(6+3) = 126 ÷ 9 = 14
46. 2÷2.5+2.5÷2 = 0.8 + 1.25 =2.05
47. 194－64.8÷1.
8×0.9 = 194 -36 x0.9 = 194-32.
4 = 161.65180－705×6 = 5180 - 4230=950
48. 24÷2.4－2.5×0.8 =10 -2=8
49. 405×(3213-3189) =405x24 = 9720
59. 125×(97-81) =125x16 =2000
60. 6942+480÷3 = 6942 + 160 = 6782
61. 20+80÷4-20 = 20 + 20 -20 = 40 -20 = 20
62. 100÷（32-30）×0 = 100 ÷2 x0= 50 x0 = 0
63. 25×4-12×5 = 100 - 60 = 40
64. 70×〔（42-42）÷18〕=70 x (0÷18) = 70x0 = 0
65. 75×65+75×35 = 75 x (65 +35) = 75x100 = 7500
66. 6-1.6÷4= 6- 0.4 = 5.6
67. 5.38+7.85-5.37= 13.23 - 5.37=7.86
68. 7.2÷0.8-1.2×5=9 - 6 =3
69. 6-1.19×3-0.43= 6-3.57 - 0.43 = 6- (3.57 + 0.43) = 6-4 = 2
70. 6.5×（4.8-1.2×4）= 6.5 x(4.8 - 4.8 )=6.5 x0 = 0
71. 0.68×1.9+0.32×1.9 = (0.68 + 0.32) x1.9 = 1 x 1.9 = 1.9
72. 10.15-10.
75×0.4-5.7 = 10.
15 - 4.3 - 5.7 = 10.
15 -(4.3 + 5.7)=10.
15 - 10 =0.15
73. 5.8×（3.
87-0.13）+4.2×3.
74 = 5.8 x 3.74 +4.
2 x 3.74 = (5.8 +4.
2)x3.74 = 10 x 3.74 = 37.
474. 32.52-（6+9.
728÷3.2）×2.5 = 32.
52 - (6+3.04)x2.5 = 32.
52 - 9.02 x 2.5 = 32.
52 -22.55 = 9.97
75.（136+64）×（65-345÷23）= 200x(65-15) = 200x 50=10000
76. 0.4×125×25×0.8 =(0.4×25)×(125×0.8)=10×100=1000
77. 1.25×(8+10) =1.25×8+1.25×10=10+12.5=22.5
78. 9123-(123+8.8) =9123-123-8.8=9000-8.8=8991.2
79. 1.24×8.3+8.3×1.76 =8.3×(1.24+1.76)=8.3×3=24.9
80. 9999×1001 =9999×(1000+1)=9999×1000+9999×1 =10008999
81. 14.8×6.
3-6.3×6.5+8.
3×3.7 =(14.8-6.
5)×6.3+8.3×3.
7=8.3×6.3+8.
3×3.7
82. 8.3×(6.3+3.7) =8.3×10 =83
83. 1.24+0.78+8.76 =(1.24+8.76)+0.78 =10+0.78 =10.78
84. 933-157-43 =933-(157+43)=933-200=733
85. 4821-998 =4821-1000+2=3823
86. i32×125×25 =4×8×125×25 =(4×25)×(8×125)=100×1000 =100000
87. 9048÷268
=(2600+2600+2600+1248)÷26
=2600÷26+2600÷26+2600÷26+1248÷269
=100+100+100+48
=348
88. 2881÷ 43 =(1290+1591)÷ 434=1290÷43+1591÷43=30+37
89. 1.8+18÷1.5-0.5×0.3 =1.8+12-0.15=13.8-0.15=13.65
90. 6.5×8+3.5×8-47 =52+28-47=80-47
91. (80-9.8)×5分之2-1.32 =70.2x2/5-1.32=28.08-1.32=26.76
92. 8×7分之4÷[1÷(3.2-2.95)]=8×4/7÷[1÷0.25]=8×4/7÷4=8/7
93. 2700×(506-499)÷900 =2700×7÷900 =18900÷900 =21
94. 33.02-(148.4-90.85)÷2.5=33.02-57.55÷2.5=33.02-23.02 =10
95. (1÷1-1)÷5.1 =(1-1)÷5.1 =0÷5.1 =0
96. 18.1+(3-0.299÷0.23)×1=18.1+1.7×1 =18.1+1.7 =19.8
97. 4.1/27+505/2727+131313/272727 =1/27+5*101/(27*101)+13*10101/(27*10101)
=1/27+5/27+13/27=19/27
98. 6.5×8+3.5×8-47 =52+28-47=80-47
99. (80-9.8)×5分之2-1.32 =70.2x2/5-1.32=28.08-1.32=26.76
100. 1.8+18÷1.5-0.5×0.3 =1.8+12-0.15=13.8-0.15=13.65
延展回答
脫式計算即遞等式計算，把計算過程完整寫出來的運算，也就是脫離橫式的計算。
在計算混合運算時，通常是一步計算一個算式(逐步計算，等號不能寫在原式上)，要寫出每一步的過程。一般來說，等號要往前，不與第一行對齊。也就是離開原式計算。
(脫字念tuo)主要掌握的是記住要先算乘、除法，後算加、減法。在乘除法連續計算時中，要按從左往右的順序依次計算。遇到括號，要首先計算括號內部。
在脫式過程中要按運算順序劃出運算順序線，還要做到"三核對"，一要核對從書上把題抄到作業本上數字、符號是否抄對。二要核對從橫式抄到草稿豎式的數字、符號是否抄對。三要核對把草稿豎式上的得數，抄到橫式上是否抄對，小數點是否點對地方，有無遺漏。
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