1125ï¼997 998+1246+9989 ï¼8700ï¼870ï¼87ï¼Ã·87
125Ã8.8 1.3ï¼4.25ï¼3.7ï¼3.75 17.15ï¼ï¼3.5ï¼2.85ï¼
3.4Ã99ï¼3.4 4.8Ã1.01 0.4Ãï¼2.5÷73ï¼
ï¼1.6ï¼1.6ï¼1.6ï¼1.6ï¼Ã25 ï¼ ï¼ ï¼ ï¼Ã·
12.3ï¼2.45ï¼5.7ï¼4.55 2 ï¼ 0.125Ã0.25Ã64
64.2Ã87ï¼0.642Ã1300 78Ã36ï¼7.8Ã741ï¼7 17ï¼ 8
0.125Ã ï¼0.5 2.42 +4.58 ï¼43
25÷100 4.25ï¼3 ï¼(2 ï¼1 )
ï¼1ï¼1.25*17.6+36.1/0.8+2.36*12.5
1.25*17.6+36.1/0.8+2.36*12.5
=(5/4)*17.6+36.1*(5/4)+23.6*(50/4)
=176/8+361/8+236/8
=773/8=96.625
ï¼2ï¼7.5*2.3+1.9*2.5
7.5*2.3+1.9*2.5
=7.5*(1.9+0.4)+1.9*2.5
=(7.5+2.5)*1.9+7.5*0.4
=19+3 =22
ï¼3ï¼2004/2003*2005
2004/2003*2005
=(2004/2003)*(2003+2)
=2004+4008/2003
ï¼4ï¼276*543-267/276+543*275
276*543-267/276+543*275
=543*(276+275)-267/276
=543*551-267/276
ï¼5ï¼17/51+ ï¼68/1+51/2ï¼*17
17/51+ ï¼68/1+51/2ï¼*17
åé¢çåä¸ä¸å»äºï¼å¥½åæä¸äºæ²¡æç®ä¾¿æ¹æ³ï¼ä¸ç¥éä½ é¢ç®æ没ææéï¼ä½ ç68/1ä¸ç68æ¯ååè¿æ¯åæ¯åï¼åºè¯¥æ¯åæ¯é½å¯¹
ï¼6ï¼ï¼3.25-0.8*8/5ï¼/ï¼6å4/1-3.5ï¼
æ¯6å1åä¹4åï¼åºè¯¥æ¯6å4åä¹1å§
1)äºåäºåäºåäºåä¹åä¸Ã79.45+159Ã47.56+ä¸åä¹åäºååä¹åä¸Ã52.44
=52.44Ã79.45+159Ã47.56+79.55Ã52.44
=52.44Ã(79.45+79.55)+159Ã47.56
=52.44Ã159+159Ã47.56
=159Ã(52.44+47.56)
=159Ã100
=15900
3)2002+2001-2000-1999+1998+1997-1996-1995+â¦â¦+2+1
=(2002-2000)+(2001-1999)+(1998-1996)+(1997-1995)+â¦â¦+(6-4)+(5-3)+2+1
=2+2+2+2+â¦â¦+2+2(ä»3-2002å
±2000个æ°ï¼æ以æ1000个2)+2+1
=1000Ã2+2+1
=2003
4ï¼5两é¢åç¨å°ä¸ä¸ªè½¬æ¢å¼1/ï¼AÃBï¼=1/ï¼B-Aï¼Ãï¼1/A-1/Bï¼
å¦1/15=1/ï¼3Ã5ï¼=1/ï¼5-3ï¼Ãï¼1/3-1/5ï¼=1/2Ãï¼2/15ï¼=1/15å¯éªè¯ä¸ä¸
4)(1Ã2åä¹ä¸)+(2Ã3åä¹ä¸)+(3Ã4åä¹ä¸)+â¦â¦+(10Ã11åä¹ä¸)
=1/(1Ã2)+1/(2Ã3)+1/(3Ã4)+â¦â¦+1/(10Ã11)
=(1-1/2)+(1/2 - 1/3)+ï¼1/3 - 1/4ï¼+â¦â¦+ï¼1/10 - 1/11ï¼
=1-1/11
=10/11
5)ä¸åä¹ä¸+åäºåä¹ä¸+ä¸åäºåä¹ä¸+å
åä¸åä¹ä¸+ä¹åä¹åä¹ä¸
=1/(1Ã3)+1/(3Ã5)+1/(5Ã7)+1/(7Ã9)+1/(9Ã11)
=1/2Ã(1-1/3)+1/2Ã(1/3-1/5)+1/2Ã(1/5-1/7)+1/2Ã(1/7-1/9)+1/2Ã(1/9-1/11)
=1/2Ã(1 - 1/3 + 1/3 - 1/5 + 1/5 - 1/7 + 1/7 - 1/9 + 1/9 - 1/11)
=1/2Ã(1-1/11)
=1/2Ã10/11
=5/11
6)ä¸åäºåä¹ä¸-å
åä¹äº+åäºåä¹ä¸-äºååä¹ä¹+ä¸ååä¹åä¸-ååäºåä¹åä¸+äºåå
åä¹åäº
(æ ¹æ®æ示ï¼1å1/2=1+1/2ï¼+1/2+1/3=5/6â¦â¦)
=(1+1/2)-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)
=1+ 1/2 - 1/2 - 1/3 + 1/3 + 1/4 - 1/4 - 1/5 + 1/5 + 1/6 - 1/6 - 1/7 + 1/7 + 1/8
=1+1/8
=9/8
1. 3/7 Ã 49/9 - 4/3
2. 8/9 Ã 15/36 + 1/27
3. 12Ã 5/6 â 2/9 Ã3
4. 8Ã 5/4 + 1/4
5. 6÷ 3/8 â 3/8 ÷6
6. 4/7 Ã 5/9 + 3/7 Ã 5/9
7. 5/2 -ï¼ 3/2 + 4/5 ï¼
8. 7/8 + ï¼ 1/8 + 1/9 ï¼
9. 9 Ã 5/6 + 5/6
10. 3/4 Ã 8/9 - 1/3
11. 7 Ã 5/49 + 3/14
12. 6 Ãï¼ 1/2 + 2/3 ï¼
13. 8 Ã 4/5 + 8 Ã 11/5
14. 31 Ã 5/6 â 5/6
15. 9/7 - ï¼ 2/7 â 10/21 ï¼
16. 5/9 Ã 18 â 14 Ã 2/7
17. 4/5 Ã 25/16 + 2/3 Ã 3/4
18. 14 Ã 8/7 â 5/6 Ã 12/15
19. 17/32 â 3/4 Ã 9/24
20. 3 Ã 2/9 + 1/3
21. 5/7 Ã 3/25 + 3/7
22. 3/14 ÃÃ 2/3 + 1/6
23. 1/5 Ã 2/3 + 5/6
24. 9/22 + 1/11 ÷ 1/2
25. 5/3 Ã 11/5 + 4/3
26. 45 Ã 2/3 + 1/3 Ã 15
27. 7/19 + 12/19 Ã 5/6
28. 1/4 + 3/4 ÷ 2/3
29. 8/7 Ã 21/16 + 1/2
30. 101 Ã 1/5 â 1/5 Ã 21
31.50ï¼160÷40 ï¼58+370ï¼Ã·ï¼64-45ï¼
32.120-144÷18+35
33.347+45Ã2-4160÷52
34ï¼58+37ï¼Ã·ï¼64-9Ã5ï¼
35.95÷ï¼64-45ï¼
36.178-145÷5Ã6+42 420+580-64Ã21÷28
37.812-700÷ï¼9+31Ã11ï¼ ï¼136+64ï¼Ãï¼65-345÷23ï¼
38.85+14Ãï¼14+208÷26ï¼
39.ï¼284+16ï¼Ãï¼512-8208÷18ï¼
40.120-36Ã4÷18+35
41.ï¼58+37ï¼Ã·ï¼64-9Ã5ï¼
42.(6.8-6.8Ã0.55)÷8.5
43.0.12à 4.8÷0.12Ã4.8
44.ï¼3.2Ã1.5+2.5ï¼Ã·1.6 ï¼2ï¼3.2Ãï¼1.5+2.5ï¼Ã·1.6
45.6-1.6÷4= 5.38+7.85-5.37=
46.7.2÷0.8-1.2Ã5= 6-1.19Ã3-0.43=
47.6.5Ãï¼4.8-1.2Ã4ï¼= 0.68Ã1.9+0.32Ã1.9
48.10.15-10.75Ã0.4-5.7
49.5.8Ãï¼3.87-0.13ï¼+4.2Ã3.74
50.32.52-ï¼6+9.728÷3.2ï¼Ã2.5
51.[ï¼7.1-5.6ï¼Ã0.9-1.15] ÷2.5
52.5.4÷[2.6Ãï¼3.7-2.9ï¼+0.62]
53.12Ã6÷ï¼12-7.2ï¼-6 ï¼4ï¼12Ã6÷7.2-6
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