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(3)76 96

(4)1/7 2m

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(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

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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

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ÒõÓ°²¿·ÖÃæ»ý= ÌÝÐÎABGD Ãæ»ý

170×2÷10-25=9 cm

P20-21

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

11/3 2/5

3¡¢ ÃÅÕï × √ √ ×

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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

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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

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(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

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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

¶¯ÄÔ½î

СÊý²¿·Ö£º(5.8-3.4)÷(8-4)=0.6

ÕûÊý²¿·Ö£º3.4-0.6×4=1

Ô­À´Ð¡Êý£º1+0.6=1.6

P28¡¢29

2¡¢Ñ¡Ôñ B B B A

4¡¢(1)24 30 (2) 21 (3) Y = 6X

5¡¢½â¾öÎÊÌâ

(1) (6+12)×(12-6+1)÷2 =63(¸ù)

(2) 3·ÖÃ×=30ÀåÃ×

50×40×(30-25)=1000Á¢·½ÀåÃ×=1Á¢·½·ÖÃ×

P3031

2¡¢Ìî¿Õ(1)14/27 21/43

(2)0.4 0.29

(5)1.6

¶¯ÄԽƴ³É³¤·½Ìåºó£¬±íÃæÓÐ10¸öСÕý·½ÐÎ

ÿһ¸öСÕý·½ÐÎÃæ»ý£º60÷10=6ƽ·½·ÖÃ×

6×6=36 ƽ·½·ÖÃ×

P3233

2¡¢Ìî¿Õ(1)< > (2)4 10 (3) 96 64

3¡¢Ñ¡Ôñ£ºC D C

5¡¢½â¾öÎÊÌâ

(1)ÓÒÊÖ£º 16÷(3-1)=8(¿Å)

×óÊÖ£º8+16=24(¿Å)

(2)½â£ºÉè²Î¼ÓµçÄÔÐËȤС×éµÄѧÉúÓÐxÈË

3x-13=53

3x=66

X=22

(3)300×2÷(35+65)=6(Ã×)

¶¯ÄԽ

8÷4=2(·ÖÃ×) 2×2×8=32(Á¢·½·ÖÃ×)

P3435

2¡¢Ìî¿Õ(1)36Â룬23ÀåÃ× ;Èô34Â룬22ÀåÃ×……

(2) 2 (3)6.8

1¡¢ ½â¾öÎÊÌ⣺

(1)(100-98)÷100=1/50

(2)0.6=3/5=36/60

2/3=40/60

38/60 ÕÅʦ¸µÊ±¼ä×îÉÙ£¬×öµÃ×î¿ì¡£

¶¯ÄԽ½â£ºÉèÿ±¾Á·Ï°±¾xÔª£¬ÄÇôÿ±¾·½¸ñ±¾x+0.16Ôª

(x+0.16)×2+5x = 6.62

6x = 6.3

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