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2015-07-15

Âþ³¤µÄÊî¼Ù£¬ÄãÒ»¶¨°²ÅÅÁ˺ܶà¼Æ»®°É£¬²»¹ÜÄãµÄÊîÆÚÉú»î¶à·è¿ñ£¬Êî¼Ù×÷Òµ»¹ÊÇÐèÒªÍê³ÉµÄ£¬ÒÔÏÂÊÇС±à¸ø´ó¼ÒÕûÀí±à¼­µÄÎåÄ꼶ÊýѧÊî¼Ù×÷Òµ´ð°¸Ëս̰档

P2-3

1¡¢2/3 4/5 2/3 0.24 10 0.3 0.23 0.6 0.18

2¡¢(1) 3.5*4 14

(2)1/5 3/5¡¡¡¡(3) 1ºÍ3 4ºÍ6 2¡¢5ºÍ6

(4)3/10

3¡¢ Ô¼=10.79 Ô¼µÈÓÚ8.39

4¡¢

(1)2.5*15=37.5(Ôª)

50-37.5=12.5(Ôª) ´ðÂÔ

(2)3/0.8=3(Ö§)......0.6(Ôª) ´ð£º×î¶àÂò3Ö§

(3)16*0.75=12(ǧÃ×)

5*2.5=12.5(ǧÃ×)

12.5>12 £¬ËûÄܹ»´Ó¼Ò×ßµ½Ñ§Ð£

(4)(46-20)*20/2=260(ƽ·½Ã×) ´ðÂÔ

¶¯ÄԽÓõ¹ÍÆ·¨ (0.6*0.6+0.6)/0.6-0.6=1

P4-5

1¡¢ 6.9 0.72 0.007 1 0.3 1.6 0.5 4/7 1

2¡¢

(1)10.26

(2)1/8 5

(3) 50 3770

(4)1.17 1ÓÖ1/12 3/4 40

(5)450-m+n

3¡¢ B C C C

4¡¢

(1)25.5÷2.5=10(¸ö)……0.5(ǧ¿Ë)

´ð£ºÐèҪ׼±¸11¸öÕâÑùµÄÆ¿×Ó

(2)¢Ù½â£ºÉèһ˫Ô˶¯Ð¬ÐèÒªxÔª£¬ÄÇôһÌ×Ô˶¯·þÐèÒª2.6xÔª

X+2.6x = 360

3.6x = 360

X = 100

2.6x=2.6*100=260

´ð£ºÂÔ

¢Ú300÷5-35=25(Ôª)

(3)½â£ºÉèÀçµÄÖÊÁ¿Îªxǧ¿Ë£¬ÄÇôƻ¹ûµÄÖÊÁ¿ÊÇ2xǧ¿Ë

2x+X = 450

3x = 450

X = 150

2x=2*150=300

´ð£ºÂÔ

¶¯ÄԽ½â£ºÉèÒÒÊÕx¶Ö£¬ÄÇô¼×ÊÕ(x+12.5)¶Ö£¬±ûÊÕ(x+X+12.5-25=2x-12.5) ¶Ö

(x+12.5)+x+(2x-12.5)=130

4x = 130

X = 32.5

¼×£ºx+12.5=32.5+12.5=45

񖜧2x-12.5=2*32.5-12.5=52.5

´ð£ºÂÔ

P6-7

1¡¢1 32.36 10.8 0.45 506 0.4 3.4 0 10/19

2¡¢

(1)12¸ö 4¸ö

(2)3/4 0.7 1

(3) 12

(4)³¤·½ÐÎ Ô²

(5)4 24

3¡¢¼ò±ã¼ÆËã

3.8×2.5×0.4 0.5×12.5×8×0.2

=3.8×(2.5×0.4) =(0.5×0.2)×(12.5×8)

=3.8×1 = 0.1×100

=3.8 = 10

4¡¢½â¾öÎÊÌâ

(1)3.8×180÷3.6=190(¸ö) ´ð£ºÂÔ

(2)0.16×75= 12 (ǧ¿Ë)

ÎÒµÄÌåÖØÔÚµØÇòÉÏÖØ¡õǧ¿Ë£¬ÔÚÔÂÇòÉÏÖØ0.16*¡õ = (ǧ¿Ë)

(3)ÏÈÇóÃæ»ý£º 10×4 + 10×1.6÷2=48(ƽ·½Ã×)

ÇóÖØÁ¿£º 0.15 × 4 8= 7.2 (ǧ¿Ë)

´ð£ºÂÔ

¶¯ÄԽ

Ç뻭ʾÒâͼ¡£ÇгÉ64¿é£¬¾ÍÊdz¤¿í¸ß¶¼Æ½¾ù·Ö³É4·Ý¡£

Èý¸öÃæÍ¿³ÉºÚÉ«µÄСÕý·½ÌåÔÚ¶¥µãλÖã¬ÓÐ 8 ¸ö;

Á½¸öÃæÍ¿Á˺ÚÉ«µÄÔÚÀⳤλÖÃ(³ýÈ¥¶¥µã)£¬Ã¿ÌõÀâ ÉÏÓÐ 2¸ö £¬12ÌõÀâ¹² 24¸ö

Ò»¸öÃæÍ¿Á˺ÚÉ«µÄÔÚÿ¸öÃæµÄÖм䣬ÿ¸öÃæÓÐ4¸ö£¬6¸öÃæ¹²24¸ö

ûͿɫµÄ 64-8-24-24=8(¸ö)

P8-9

1¡¢ ¿ÚËã 20.7 1.9 72.8 42.42 0.05 6.3 1 1/12 13

2¡¢ Ìî¿Õ

(1) ÓÒÃæ

(2) ºóÃæ

(3) ×óÃæ

(4) ºóÃæ

3¡¢ ¼òËã

0.56×3.68+6.32×0.56 7.8×10.1

=0.56×(3.68+6.32) = 7.8×(10+0.1)

=0.56×10 = 7.8×10 + 7.8×0.1

=5.6 = 78.78

4¡¢ ½â¾öÎÊÌâ

(1)24ÀåÃ×=0.24Ã×

65×0.24×2.5=39 (Á¢·½Ã×)

525×39= 20475 (¿é) ´ð£ºÂÔ

(2)600÷4-80=70(ǧÃ×/ʱ)

´ð£ºÂÔ

(3)±í£ºÂÔ;ͼ£ºÂÔ³ÉÒ»ÌõÖ±Ïß

¢ÙÎÒ·¢ÏÖÁË (µØשµÄ¿éÊýÊǵØÃæÃæ»ýµÄ12±¶)

¢Ú1440¿é

5¡¢ ¶¯ÄÔ½î

µÚÒ»×飺1, 2, 3, 4

µÚ¶þ×飺2, 4, 6, 8

µÚÈý×飺3, 6, 9, 12

µÚËÄ×飺4£¬ 8 12 16

…….

µÚn×飺n, 2n 3n 4n

µÚ100×飺100£¬ 200, 300, 400 ºÍÊÇ 1000

P10-11

1¡¢ ¿ÚËã0.12 0.96 2.25 2.1 2.3 50 5/6 0.16 1/2

2¡¢ Ìî¿Õ

(1) 15+2a 15h÷2=7.5h

(2) µ¥Î»“1” 7 3

(3)1/4 10 10/13 13

3¡¢ Ñ¡Ôñ B A B D

4¡¢ ËãÒ»Ëã

±íÃæ»ý£º(8×5 + 8×3 + 5×3)×2 =158 (ƽ·½·ÖÃ×)

Ìå»ý 8×5×3=120 (Á¢·½·ÖÃ×)

5¡¢ ½â¾öÎÊÌâ

(1)0.75×25×4=75 (Ôª) ´ð£ºÂÔ

(2)(40+60)×84÷2=4200 (ƽ·½Ã×)

5.5×4200= 23100 (Ôª) ´ð£ºÂÔ

(3)1- 1/5- 5/12 = 23/60 ´ð£ºÂÔ

P12-13

1¡¢ ¿ÚËã6.72 3.7 107.1 0.096 3 0.3 2.5 1 0.406

2¡¢ Ìî¿Õ

(1)ËÄ ¶þ

(2)a b

(3)145 14.5 1450 14.5 145 0.0145

3¡¢ ½â·½³Ì

X=5 x=3.6 x=1.1

4¡¢ ½â¾öÎÊÌâ

(1) ½â£ºÉè¹ûÔ°ÀïÀæÊ÷ÓÐx¿Ã£¬ÄÇôÌÒÊ÷ÓÐ3x¿Ã

3x+x=160

4x=160

X=40

3x=3*40=120 ´ð£ºÂÔ

(2) ½â£ºÉèÒÒ´¬Ã¿Ð¡Ê±º½ÐÐxǧÃ×

2.5(28+x)= 150

28+x = 60

X = 32

´ð£ºÂÔ

(3) ½â£ºÉèË®¸×ÀïµÄË®ÉÏÉýx·ÖÃ×

7×6×(2.8+x)=7×6×2.8 + 4×4×4

X = 1.523…

4-2.8 < 1.523 »áÒç³ö

(4) ½â£ºÉèx·ÖÖÓ¿ÉÒÔÈ«²¿Í¨Öªµ½31ÈË

2 n-1=31

N=5

¶¯ÄÔ½î

ÒõÓ°²¿·ÖµÄÃæ»ý¾ÍÊÇÌÝÐÎEFCOµÄÃæ»ý

(10-4+10)×2÷2=16 (ƽ·½ÀåÃ×)

P14-15

1¡¢ ¿ÚËã92.4 0.2 1.16 7 0.5 0.99 4.6 0.902 2

2¡¢ Ìî¿Õ

(1)2/7 7/12

(2)5x

(3)4a a2

(4)3x+2 3x+2=41

(5)1.1 1.08

3¡¢ Êúʽ¼ÆËã

287.1 8.9

4¡¢ ½â¾öÎÊÌâ

(1) 40÷(50×2)=0.4(·ÖÖÓ)

(2) 495÷(100-1)=5(ǧ¿Ë)

(3) ºìÉ«1/4 »Æ 1/4 À¶ 1/2

(4) 160 ÷ 8 × 4 = 80 (´Î)

5¡¢ ¶¯ÄÔ½î 3/16

P16-17

1¡¢ ¿ÚËã 13.27 0.18 0.72 0.56 0.75 50 3/4 7/12 7/10

2¡¢ Ìî¿Õ

(1)52cm 92 ƽ·½ÀåÃ×

(2)7/8 8/8

(3)76 96

(4)1/7 2m

3¡¢ Ñ¡Ôñ

(1)B

(2)A

(3)C

4¡¢ ½â·½³Ì

X=0.49 x=7.15 x = 4.2

5¡¢ Êúʽ¼ÆËã

8.579 5.14375

6¡¢ ½â¾öÎÊÌâ

(1)½â£ºÉèË®¹ûÊг¡ÔËÀ´Àçx¶Ö

3x-0.3=5.4

X =1.9

(2)½â£ºÉè´óÃ×ÿǧ¿ËxÔª

15(x+3.7)=102.6

X = 3.14

(3)½â£ºÉèÀæÊ÷ÓÐx¿Ã£¬ÄÇôÌÒÊ÷µÄ¿ÃÊ÷ÓÐ3x¿Ã

3x-x = 80

X = 40

3x=40×3=120

7¡¢ ¶¯ÄÔ½î

10 + 10÷2×2 + 10÷2÷2×2 + 10÷2÷2÷2×2 = 27.5 Ã×

P 18-19

1¡¢¿ÚËã7.2 184.2 0.01 9.42 2/3 180 1 7/10 1/5

2¡¢Ìî¿Õ

(1)0.85 7Éý50ºÁÉý

(2) 21

(3)4.95 5.0

(4)3.7

3¡¢¹Û²ì

AB³¤3ÀåÃ× CDÊÇABµÄÒ»°ë

4¡¢½â·½³Ì

X=18 x=3.7 x=7 x=62

5¡¢»­Ò»»­

6¡¢ºËË㷢Ʊ

50×4.58=229.00

23×7.60=174.80

2×20=40.00

ºÏ¼Æ£º229+174.8+40=443.8 ÁãÍòÁãǪËÁ°ÛËÁÊ°ÈþÔª°Æ½ÇÁã·Ö

¶¯ÄԽ

ÒõÓ°²¿·ÖÃæ»ý= ÌÝÐÎABGD Ãæ»ý

170×2÷10-25=9 cm

P20-21

1¡¢ ¿ÚËã

2¡¢ Ìî¿Õ(1)14 5 (2) 4 3 3 2 4 2 (3)1/4 43/1000

11/3 2/5

3¡¢ ÃÅÕï × √ √ ×

4¡¢ ÃÜÆÌ ³¤·½ÐΡ¢ÕýÁù±ßÐΡ¢Æ½ÐÐËıßÐΡ¢Èý½ÇÐΡ¢ÌÝÐÎ

5¡¢ ½â¾öÎÊÌâ

(1)12.8÷(6.4×1.6)=1.25 (Ã×)

(2)3×2×0.5 = 3(Á¢·½Ã×) 750×3=2250(ǧ¿Ë)

(3)(20.5-10)÷1.5 + 4 = 11(ǧÃ×)

6¡¢ ¶¯ÄÔ½î

¼×°àºÍÒÒ°à¼ÓÉϱû°àºÍ¶¡°à£¬Ëĸö°à¼¶ÈËÊý¼õÈ¥ÒÒ°àºÍ±û°à£¬¾ÍÊǼװàºÍ¶¡°àµÄ¡£

83+88-86=85(ÈË)

P22-23

1¡¢ ¿ÚËã

2¡¢ Ìî¿Õ(1)24 8 (2)8 (3)6 315800(д)

3¡¢ ¼ÆËã1ÓÖ1/9 2

4¡¢ ²éÒ»²é

±±¾©010 Ìì½ò022 ÉϺ£021 ¹ãÖÝ020 º¼ÖÝ0571 ÎÂÖÝ0577

ÏÃÃÅ0592 ÖØÇì023 ÎÚ³ľÆë0991

5¡¢ ½â¾öÎÊÌâ(תÔØ×Ô³ö¹úÁôѧÍøhttp://www.liuxue86.com£¬Çë±£Áô´ËÐÅÏ¢¡£)

(1)1-5/8=3/8

(2) ÒѾ­ÐÞÁËÈ«³¤µÄ¼¸·ÖÖ®¼¸?1/3+1/4=7/12 ……

(3)2.5×2÷2=2.5(Ã×)

(4)ÄÜÕÒµ½£¬ÕâÕÅѧÉú¿¨±íʾ¹âÃ÷Сѧ2006ÄêÈëѧµÄ3°àµÄ12ºÅ

»¹¿ÉÒÔÔÚĩλÓÃ1±íʾÄÐÉú£¬ÓÃ2±íʾŮÉú¡£

6¡¢ ¶¯ÄÔ½î95÷(2+3)=19 2×19=38 3×19=57 38/57

P24-25

1¡¢

2¡¢Ìî¿Õ(1)Á¢·½Ã× ºÁÉý 1800

(2)1/4 17/2 1/25 1/5

3¡¢ÅÐ¶Ï × √ ×

P26-27

2¡¢Ìî¿Õ£º(1)4 96 (2)83/1000 25/366 (3) a -10b

3¡¢ÌîÒ»Ìî (1)ÂÌÉ« À¶É« ºÚÉ«

(2) 3

4¡¢14.54 7.245

5¡¢Ñ¡ÔñC ÒòΪ ǽÃæµÄ³¤ºÍ¿í·Ö±ðÄܱ»´ÉשµÄ³¤¿íÕû³ý¡£

6¡¢½â¾öÎÊÌâ

(1)[3,4]=12£¬ 12 ×4=48

(2)8.5 ×6 +( 8.5 ×3 + 6 ×3)×2 -12.5 = 125.5 (ƽ·½Ã×)

125.5×6=753(Ôª)

(3)(10+1)×8=88Ôª

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