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2015-07-15
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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
Çë»Ê¾Òâͼ¡£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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