1.25×（8+10）10 8+1.25=1.25××=10+12.5=22.5
123+8.89123-（）=9123-123-8.8
=9000-8.8
=8991.2
1.76 1.24××8.3+8.31.24+1.76) ×（=8.33=24.9 =8.3×1001 9999× =9999×（1000+1）1 =9999×1000+9999×=10008999
3.7 ＋8.3×6.3-6.314.8××6.53.7 ×6.3=（14.8-6.5）×＋8.33.7 6.3+8.3=8.3×× ×（6.3＋）3.78.310 =8.3×=83
1.24+0.78+8.76
+0.78
）1.24+8.76（=
=10+0.78
=10.78
933-157-43
（157+43）=933-=933-200
=733
4821-998
=4821-1000+2
=3823
25 I32×125×25 8××125×=4 125）84=（×25）×（×1000 =100×=100000
268 9048÷26
2600+2600+2600+1248）÷=（269 26+124826+2600=2600÷÷26+2600÷÷=100+100+100+48
=348
43
2881÷434 ）÷1290+1591 （=43
÷43+1591÷=1290．
=30+37
16 42.33.2××3.75-12.5×0.423×1.6 42.3×42.3×3.75-1.25×=3.2×1.6) ×(3.2××3.75-1.25=42.30.4) 4×3.75-1.25(4=42.3××0.8××0.4) 2(4=42.3××0.4××3.75-1.25××4(4x0.4x7.5-1.25x4x0.4) =42.3×(7.5-1.25)] ×0.4=42.3×[4×6.25] ×0.4×[4=42.3×2.5) ×(4=42.3×=4237
0.3 1.5-0.51.8+18÷×=1.8+12-0.15
=13.8-0.15
=13.65
8-47 ×8+3.5×6.5=52+28-47
=80-47
2-1.32 5(80-9.8)×分之=70.2X2/5-1.32
=28.08-1.32
=26.76
(3.2-2.95)] ÷÷7分之4[1×80.25] ÷×4/7÷[1=84 ÷=8×4/7=8/7
900 －506499）÷2700×（900 ×7÷=2700900 =18900÷=21 2.5 90.85）÷－33.02－（148.42.5 57.55÷=33.02－23.02 =33.02－=10
5.1 ）÷1（1÷－15.1 1=（－1）÷5.1 =0÷=0
1 －）×0.299÷0.23318.1＋（1 ×1.7=18.1＋1.7 =18.1＋=19.8
[-18]+29+[-52]+60= 19
[-3]+[-2]+[-1]+0+1+2= -3
[-301]+125+301+[-75]= 50
[-1]+[-1/2]+3/4+[-1/4]= -1
[-7/2]+5/6+[-0.5]+4/5+19/6= 1.25
[-26.54]+[-6.14]+18.54+6.14= -8
1.125+[-17/5]+[-1/8]+[-0.6]= -3
[-98+76+(-87)]*23[56+(-75)-(7)]-(8+4+3)
5+21*8/2-6-59
68/21-8-11*8+61
-2/9-7/9-56
4.6-(-3/4+1.6-4-3/4)
1/2+3+5/6-7/12
[2/3-4-1/4*(-0.4)]/1/3+2
22+(-4)+(-2)+4*3
-2*8-8*1/2+8/1/8
(2/3+1/2)/(-1/12)*(-12)
(-28)/(-6+4)+(-1)
2/(-2)+0/7-(-8)*(-2) (1/4-5/6+1/3+2/3)/1/2
18-6/(-3)*(-2)
(5+3/8*8/30/(-2)-3
(-84)/2*(-3)/(-6)
1/2*(-4/15)/2/3
-3x+2y-5x-7y
15 1437×27＋27×563 〔75-（〕÷12+18）5 2160÷〔（83-79）×18〕 280＋840×÷2424)
325÷13×(266－250) 85×(95－1440÷563 58870÷(105＋20×2) 1437×27＋27×30
81432÷(13×52＋78) [37.85-（7.85+6.4）] ×64 ×156[(17.7-7.2)÷3] （947－599）＋76×67 －36×(913276÷23) [192－（54＋38）]×78)
）×[（7.1-5.60.9-1.15]÷2.5 81432÷(13×52＋0.43599）＋76×64 60－(9.5＋28.9)]0.18 2.881÷÷3.7-2.95.4÷[2.6×（）+0.62] （947－ 〕×〔15.5-(3.21 5.79)0.15] 28-(3.4 1.25×2.4) 0.8＋3.5 －0.24×20×[(2.44－1.8)÷0.4[(100.8×0.016（×35） ×4（31.8 3.2×）÷5 194－64.8÷1.80.9 36.72÷4.25×9.9 3.416÷1.2]
÷－6.76)8.5 0.55)×÷23） (6.8-6.8）×（（136+6465-345÷ 5）58+37）÷（64-9×÷0.12× 4.80.12×4.8 （1.6 1.5+2.5）÷（3.2××812-700÷（9+3111）
18+35
÷120-36×4）85+14×（14+208÷26
7 ÷×1.6-18.3059.72（284+16）×（512-8208÷18）
7/3+7/10
（4/5+1/4）÷[1/34/7÷×（3/5-3/10）]
2365-345÷）136+641137.812-700156.6 ） ÷（9+31×） （）×（＋ 012.78－÷（13.41.6 ）÷×（1.5+2.53.2 ）5×64-9）÷（58+37（ ）26÷14+208×（85+14．
512-8208）÷18（×(6.8-6.80.55)÷8.5 284+16）×（1.6 ）÷1.5+2.54.8 4.8× ÷0.12×（3.2×0.120.4-5.7
×18+35 10.15-10.75120-36×4÷52 +4.23.87-0.13）×3.74 347+45×2-4160÷5.8×（ 564-9×）58+373.232.52-（6+9.728÷）×2.5 87（）÷（1.6 ）÷3.20.9-1.15] [（7.1-5.6）×÷2.5 （×1.5+2.5-6 [2.65.4÷×（3.7-2.9））12-7.2+0.62] 12×6÷（1.6 ）÷3.21.6 1.5+2.5×6+（）÷（×1.5+2.53.23.74 ×（×3.87-0.13）+4.25.82.5 90.85148.433.02－（－）÷1)23+(-73)
(2)(-84)+(-49)
(3)7+(-2.04)
(4)4.23+(-7.57)
(5)(-7/3)+(-7/6)
(6)9/4+(-3/2)
(7)3.75+(2.25)+5/4
(8)-3.75+(+5/4)+(-1.5)
(9)(-17/4)+(-10/3)+(+13/3)+(11/3)
(10)(-1.8)+(+0.2)+(-1.7)+(0.1)+(+1.8)+(+1.4)
(11)(+1.3)-(+17/7)
(12)(-2)-(+2/3)
(13)|(-7.2)-(-6.3)+(1.1)|
(14)|(-5/4)-(-3/4)|-|1-5/4-|-3/4|)
(15)(-2/199)*(-7/6-3/2+8/3) (16)4a)*(-3b)*(5c)*1/6
49/9 - 4/3 1. 3/7 ×
15/36 + 1/27 2. 8/9 ×
3 3. 12× 5/6 – 2/9 ×5/4 + 1/4 4. 8×
6 ÷5. 6 3/8 – 3/8 ÷5/9 6. 4/7 × 5/9 + 3/7 ×
7. 5/2 -（ 3/2 + 4/5 ） 8. 7/8 + （ 1/8 + 1/9 ）5/6 + 5/6 ×9. 9
8/9 - 1/3
10. 3/4 ×=28+4.4 χ－5)×0.3=1.02 6.4χ-χ×0.12χ＋1.80.9=7.2 (95/49 + 3/14 11. 7 ×
12. 6 ×（1/2 + 2/3 ）11/5 4/5 + 8 13. 8 × ×
5/6
5/6 × – 14. 31
10/21 ）2/7 15. 9/7 - （ –2/7 –14 ×18 ×16. 5/9
3/4
×25/16 + 2/3 ×17. 4/5
12/15 5/6 × 8/7 18. 14 × –
9/24 × 19. 17/32 – 3/4
2/9 + 1/3 × 20. 3
3/25 + 3/7 21. 5/7 ×2/3 + 1/6 22. 3/14 ××2/3 + 5/6 23. 1/5 ×1/2 24. 9/22 +
1/11 ÷
11/5 + 4/3 25. 5/3 ×
15 26. 45 ×2/3 + 1/3 ×
5/6 27. 7/19 + 12/19 ×2/3 28. 1/4 + 3/4 ÷21/16 + 1/2 29. 8/7 ×21 1/5 30. 101 × – 1/5 × 64-4531.50＋160÷40 （58+370）÷（）18+35 ÷32.120-14452
÷33.347+45×2-4160 ）58+3734（）÷（64-9×5 ）35.95÷（64-4528
÷5÷×6+42 420+580-64×2136.178-145 ÷23）136+6411÷（9+31×） （）×（65-34537.812-700 ）2638.85+14×（14+208÷ ）18÷512-8208）×（284+16（39.
18+35 40.120-364÷× ））÷（58+3764-9×541.（8.5 ÷×42.(6.8-6.80.55)4.8
÷0.12×4.843.0.12×
1.6 3.21.6 3.244.（×1.5+2.5）÷（2）×（1.5+2.5）÷4= 5.38+7.85-5.37= 45.6-1.6÷3-0.43=
46.7.2÷5= 6-1.19×0.8-1.2×1.9 ×1.9+0.32×= 0.684.8-1.247.6.5×（×4）0.4-5.7
48.10.15-10.75×3.74 3.87-0.1349.5.8×（）+4.2×2.5 ）×3.26+9.72850.32.52-（÷51.-5+58+13+90+78-(-56)+50
52.-7*2-57/(3
53.(-7)*2/(1/3)+79/(3+6/4）54.123+456+789+98/(-4)
55.369/33-(-54-31/15.5)
56.39+{3x[42/2x(3x8)]}
57.9x8x7/5x(4+6)
58.11x22/(4+12/2)
59.94+(-60)/10
1.
a^3-2b^3+ab(2a-b)
=a^3+2a^2b-2b^3-ab^2
=a^2(a+2b)-b^2(2b+a)
=(a+2b)(a^2-b^2)