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1、1, , : , 12- , 8-,2, .,1=( ),1000,1=( ),10,1=( ),10,1=( ),10,30=( ),3000,300=( ),30,15=( ),1500000,40=( ),4,3, :,:,:,4,5,6, ( ) . .,7, .,8, = : ,9,1:100000000 ., 1:100000000,10,:, 1cm 50km .,11,(1) . .,(2) .,(3) 1 .,12,13, . .,14, 1 ., 2:1,15, ., : ,=1cm:50km,=1cm:5000000cm,=1:5000000,16,50cm:40m =5
2、0cm:4000cm =1:80 : 1:80,50cm:40m = = : , , 40m 50cm ,17,(1) 1:2000 1cm cm ( ) m( ) .,2000,20,(2) 1:250000 1cm km( ) .,2 .5,(3) 1:4000000 ( ) ( ) . ,0 40km,4000000,18, , 100 1:100 ( ), ( ),19,(1) 5cm 200m ( ),5：200 B. C.1：4000厘米,B,(2)4cm 40mm ( ),C,1：10 B. 10：1 C. 1：1 D. 1,(3) ( ),0 23km,A. 1：23 B. 1
3、：2300000 C. 1：2300000km,B,20,20cm, 5mm ( ),4:1, ,21,(1) (2) , :,22, 10cm ,23,: 50km.,5000000cm50km,24,好 好 学 习,天 天 向 上,80m,60m,3-:,25,求出它们的比值，你发现了什么？, 10cm 10m , .,10cm10m,10m1000cm,1010001100,（ ）,: 1:100,26, 1:6000000 15cm km,27, 900m ( ), ,28, 1:5000000 3.4cm .,29,3.6cm,22.5cm,9000km, , , ,30,- 1900km 1:40000000 ,- 4.75cm,31, ., 4.5cm ,1cm:40km=1:4000000,32, 40m 50cm , : ,:,50cm:40m 50cm:4000cm 1:80 ,80,1,33,(1) : 1cm : 600m =1cm : 60000cm =1 ：60000,(2) :,(1) .,34,-,