六年级简算

六年级简算 六年级简便运算 2009-01-22 09:44 158+262+138 2 375+219+381+225 3 5001,247,1021,232 4 (181+2564)+2719 5 378+44+114+242+222 6 276+228+353+219 7 (375+1034)+(966+125) 8 (2130+783+270)+1017 9 99+999+9999+99999 10 7755,(2187+755) 11 2214+638+286 12 3065,738,1065 13 899+344 14 2357,183,317,357 15 2365,1086,214 497,299 16 2370+1995 17 3999+498 18 1883,398 19 12×25 20 75×24 25×4/25×4 57.26,(5.26,1.5) 106.25+3.85,2.125+3.875 11.9,2456×21 5/11,4×2.75 13.375+5.75+2.25+6.625 (15.1,9036)?18 163.8×5.25+14.5 172.1×4.3+5.7×2.1 19.102×45-328 2.8×3.1+16/8 23?(50-12.5) ?2.5 24×2/5×1/3 25.6?110×47+639 3.5×2.7-52.2/18 28,1/7×1/5 3.375×0.97+0.97×6.625 6.54+2.4+3.46+0.6 95.6×1.8+95.6×8.2 35.6,420/12×4 344/3.6-5.4×0.25 16/2+30/2+90/6 5000-105×34 0.15/0.25+0.75×1.2 41×(1/2+1/3+1/4)×0.24 42×(25+4)×4 3×63/21,84 0.81/0.25+5.96×5 403?13×27 46.1.5×4.2,0.75?0.25 3.27×4 +3.27×5.7 (1.2+ 1.8)×4.51025,768?32 0.25×80,0.45?0.9 50.1025,768?32 81.2,11?7,×3= 6696?62,6.5×10.6 = 2/7×3/9 ?2/7 = 6756,193,207= 97×360，3×360= 4/9×3= 5?1/3 = 1/2?1/3 = 2/7×3/9 ?2/7 = 21/25?42= 4/5×3/4 = 8.7×0.2= 4×0.25= 1/7×14= 2/3?5/6= 1.25×8= 3/5?5/8= 6/7×3/2= 6×8.8= 4/11?4= 4/9×3/8= 5/3?5= 0?8/3= 4/7 ,2/3= 2/7×2 , 41/12×4= 4?3/16= 12?9/4 = 75/8 ?5= 12×16/9 , 2/3×3, 8?9/4 , 5/3?3/5 , 4/5×5/8 , 7/9×9/7 , 2.64，3.6= 2.4×50= 3500?70= 2050,298= 2，7?9= 0.3?3%= 81.2,11?7,×3= 6696?62,6.5×10.6 = 1125,997 998+1246+9989 (8700，870，87)?87 125×8.8 1.3，4.25，3.7，3.75 17.15,(3.5,2.85) 3.4×99，3.4 4.8×1.01 0.4×(2.5?73) (1.6，1.6，1.6，1.6)×25 ( ， , )? 12.3,2.45,5.7,4.55 2 ， 0.125×0.25×64 64.2×87，0.642×1300 78×36，7.8×741,7 17， 8 0.125× ，0.5 2.42 +4.58 ,43 25?100 4.25,3 ,(2 ,1 ) (1) 1.25*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 (2)7.5*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 (3)2004/2003*2005 2004/2003*2005 =(2004/2003)*(2003+2) =2004+4008/2003 (4)276*543-267/276+543*275 276*543-267/276+543*275 =543*(276+275)-267/276 =543*551-267/276 1.125*3+125*5+25*3+25 2.9999*3+101*11*(101-92) 3.(23/4-3/4)*(3*6+2) 4. 3/7 × 49/9 - 4/3 5. 8/9 × 15/36 + 1/27 6. 12× 5/6 – 2/9 ×3 7. 8× 5/4 + 1/4 8. 6? 3/8 – 3/8 ?6 9. 4/7 × 5/9 + 3/7 × 5/9 10. 5/2 -( 3/2 + 4/5 ) 11. 7/8 + ( 1/8 + 1/9 ) 12. 9 × 5/6 + 5/6 13. 3/4 × 8/9 - 1/3 14. 7 × 5/49 + 3/14 15. 6 ×( 1/2 + 2/3 ) 16. 8 × 4/5 + 8 × 11/5 17. 31 × 5/6 – 5/6 18. 9/7 - ( 2/7 – 10/21 ) 19. 5/9 × 18 – 14 × 2/7 20. 4/5 × 25/16 + 2/3 × 3/4 21. 14 × 8/7 – 5/6 × 12/15 22. 17/32 – 3/4 × 9/24 23. 3 × 2/9 + 1/3 24. 5/7 × 3/25 + 3/7 25. 3/14 ×× 2/3 + 1/6 26. 1/5 × 2/3 + 5/6 27. 9/22 + 1/11 ? 1/2 28. 5/3 × 11/5 + 4/3 29. 45 × 2/3 + 1/3 × 15 30. 7/19 + 12/19 × 5/6 31. 1/4 + 3/4 ? 2/3 32. 8/7 × 21/16 + 1/2 33. 101 × 1/5 – 1/5 × 21 34.50，160?40 35.120-144?18+35 36.347+45×2-4160?52 37(58+37)?(64-9×5) 38.95?(64-45) 39.178-145?5×6+42 40.812-700?(9+31×11) 41.85+14×(14+208?26) 43.120-36×4?18+35 44.(58+37)?(64-9×5) 45.(6.8-6.8×0.55)?8.5 46.0.12× 4.8?0.12×4.8 47.(3.2×1.5+2.5)?1.6 48.6- 1.6?4= 5.38+7.85-5.37= 49.7.2?0.8-1.2×5= 6-1.19×3-0.43= 50.6.5×(4.8-1.2×4)= 51.5.8×(3.87-0.13)+4.2×3.74 52.32.52-(6+9.728?3.2)×2.5 53.[(7.1-5.6)×0.9-1.15] ?2.5 54.5.4?[2.6×(3.7-2.9)+0.62] 55.12×6?(12-7.2)-6 56.12×6?7.2-6 57.0.68×1.9+0.32×1.9 58.58+370)?(64-45) 59.420+580-64×21?28 60.136+6×(65-345?23) 15-10.75×0.4-5.7 62.18.1，(3,0.299?0.23)×1 63.(6.8-6.8×0.55)?8.5 64.0.12× 4.8?0.12×4.8 65.(3.2×1.5+2.5)?1.6 66.3.2×6+(1.5+2.5)?1.6 67.0.68×1.9+0.32×1.9 68.10.15-10.75×0.4-5.7 69.5.8×(3.87- 0.13)+4.2×3.74 70.32.52-(6+9.728?3.2)×2.5 71.[(7.1-5.6)×0.9-1.15] ?2.5 72.5.4?[2.6×(3.7-2.9)+0.62] 73.12×6?(12-7.2)-6 74.12×6?7.2-6 75.33.02,(148.4,90.85)?2.5 1) 76.(25%-695%-12%)*36 77./4*3/5+3/4*2/5 78.1-1/4+8/9/7/9 79.+1/6/3/24+2/21 80./15*3/5 81.3/4/9/10-1/6 82./3+1/2)/5/6-1/3]/1/7 83./5+3/5/2+3/4 84.(2-2/3/1/2)]*2/5 85.+5268.32-2569 86.3+456-52*8 87.5%+6325 88./2+1/3+1/4 2009-01-22 09:42好几回广东|十五级 小学六年级数学总复习资料 10,2.65, 0.9×0.08, 528,349, 6，14.4, 24?0.04, 12.34,2.3, 0?3.8, 0.77，0.33, 7?1.4, 67.5，0.25,7.2?8×4, 5,1.4,1.6, 400?125?8, 1.9×4×0.5, 80×0.125= 3× = 6 6= 2 ,( + )= 10 2= )×12= 187.7×11,187.7= 1, 62.5%= 二、写出下列每题在简便运3.2×7?3.2×7= ( , 算时所运用的定律或性质(12分) 4 +3.2，5 +6.8 25×(8×0.4)×1.25 7 ,(2 , ) ( ) ( ) ( ) ( ， + )×72 93.5?3 16?2.5 ( ) ( ) ( ) 三、用简便方法计算。(65分) 1125,997 998+1246+9989 (8700，870，87)?87 125×8.8 1.3，4.25，3.7，3.75 17.15,(3.5,2.85) 3.4×99，3.4 4.8×1.01 0.4×(2.5?73) (1.6，1.6，1.6，1.6)×25 ( ， , )? 12.3,2.45,5.7,4.55 2 ， 0.125×0.25×64 64.2×87，0.642×1300 78×36，7.8×741,7 17， 8 0.125× ，0.5 2.42 +4.58 ,43 25?100 4.25,3 ,(2 ,1 ) (1)1.25*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 (2)7.5*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 (3)2004/2003*2005 2004/2003*2005 =(2004/2003)*(2003+2) =2004+4008/2003 (4)276*543-267/276+543*275 276*543-267/276+543*275 =543*(276+275)-267/276 =543*551-267/276 (5)17/51+ (68/1+51/2)*17 17/51+ (68/1+51/2)*17 后面的做不下去了，好像有一些没有简便方法，不知道你题目有没有抄错，你的68/1中的68是分子还是分母呀,应该是分母都对 (6)(3.25-0.8*8/5)/(6又4/1-3.5) 是6又1分之4吗,应该是6又4分之1吧 1)五十二又二十五分之十一 ×79.45+159×47.56+七十九又二十分之十一×52.44 =52.44×79.45+159×47.56+79.55×52.44 =52.44×(79.45+79.55)+159×47.56 =52.44×159+159×47.56 =159×(52.44+47.56) =159×100 =15900 3)2002+2001-2000-1999+1998+1997-1996-1995+……+2+1 =(2002-2000)+(2001-1999)+(1998-1996)+(1997-1995)+……+(6-4)+(5-3)+2+1 =2+2+2+2+……+2+2(从3-2002共2000个数，所以有1000个2)+2+1 =1000×2+2+1 =2003 4，5两题均用到一个转换式1/(A×B)=1/(B-A)×(1/A-1/B) 如1/15=1/(3×5)=1/(5-3)×(1/3-1/5)=1/2×(2/15)=1/15可验证一下 4)(1×2分之一)+(2×3分之一)+(3×4分之一)+……+(10×11 分之一) =1/(1×2)+1/(2×3)+1/(3×4)+……+1/(10×11) =(1-1/2)+(1/2 - 1/3)+(1/3 - 1/4)+……+(1/10 - 1/11) =1-1/11 =10/11 5)三分之一+十五分之一+三十五分之一+六十三分之一+九十九分之一 =1/(1×3)+1/(3×5)+1/(5×7)+1/(7×9)+1/(9×11) =1/2×(1-1/3)+1/2×(1/3-1/5)+1/2×(1/5-1/7)+1/2×(1/7-1/9)+1/2×(1/9-1/11) =1/2×(1 - 1/3 + 1/3 - 1/5 + 1/5 - 1/7 + 1/7 - 1/9 + 1/9 - 1/11) =1/2×(1-1/11) =1/2×10/11 =5/11 6)一又二分之一-六分之五+十二分之七-二十分之九+三十分之十一-四十二分之十三+五十六分之十五 (根据提示，1又1/2=1+1/2，+1/2+1/3=5/6……) =(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