六年级数学下册《比例的基本性质》课件PPT

1、1?1? ?1 ? ? ?1 ? ?ia?i?:? ?i?i? ?i? 12-?1 ?ii ?a?1i ? ?11i1?1? ?1? ?2?ulim2.4 1.6 = 60 40?u ?i? ?3?d.ti ?a?1i ? ?体?i ? ?1?i1?t? ?体?4.5 2.7 = 10 6 6 10 = 9 15?i? ?i? 2131=6 443410.6 0.2=?u ?u ?i?1 ?i? ?u ?i? ?u ?i? ?42.4 1.6 = 60 40?u ?1 ?i? ? ?li?:1.6 6096?u ? ?li?:2.4 40 962.4 401.6 60 ?ulim:5?d.ti

2、 ?a?1i ?体?i?1 ? ?1i?at? ?a14 50 = 0.2 2.58 5 = 6 3?i? ?i?4 2.5 = 10:?u ? ?li?:?i? ? ?li?:?u ? ?li?:?i? ? ?li?:?u ? ?li?:?i? ? ?li?:?u ? ?li?:?i? ? ?li?50 0.2 = 108 3 = 185 6 = 30(1)(2)61:3141:21(3)43:2.15:(4)5351.2=6121112146?i?i?i?u?iiguiu ?i? ?u ?ii? ?li? ?i? ?i? ?ii? ?ili? ? ?i?. ? ?i?iiguiu ?igu

3、gu? ?i?g?g? ?99 ?i?iu?7 - 6?m(1)(1) 140:12160:14(2) 30:2=120:8(3) 30:240:3100:5=200:10?iguiu ?i?iguiu ?i?iguiu ?9?iguiu ?9?14012=11.666.16014=11.4285.302=15 1208=15302=15 403=13.333.1005=20 20010=208 - 6?m(2)?ii9? ?i9?iug ?iguiu u?i?i?iu?ii? ?a ?i?i?15 : 5=12 : 4(1) 4? 5? 12 ? 15(2) 2 , 3 ,4 , 5?igu

4、iu ?i?iguiu ?9?(3)31612141： 155=3124=3?iguiu ?9?2136131612124121411.6 ?6.4 ?2 ?5 ?iguiu ?i?9 - 6?m(4)? ?i?- 2?u? ?ua ? 9? ? ?u? ? ?i?i?i?iug ?ilii 3 : 4? 2-?u? 99i?i?ia? ua 12? ?16? ? ?u?.?u? ? ?iguiu ?m9?iguiu ?9?u ?g?:316=48?i? ?:412=48 - 6?m(5)(1) 28 : 40 = 1.4 : 2282=56401.4=565:1214185： 8121418

5、15185?iguiu ?9?iguiu ?9?10?i? ?i?a?1i ?1? d. ?i1?1? ?1? ?1d.ti ?1 ?aa? ?ii?1?1? ?i ?1i ?体? ?t ?.1.4 2 ?7 10 ?i?： 1.4 2 0.7 ? 24.1 ：? 710 ?1i ?1i ?. ?i?： 1.4 10 14 2 7 14?i?iiguiu ?lii?m ?i?:7 10 = 0.7?igugu? ?i?g?g? ?i?:0.7 = 0.714 = 14? 24.1 ：? 710 ?1i ?1i ?.11?a?1i ?1? d. ?i1?1? ?1? ?1d.ti ?1 ?aa?

6、 ?ii?1?1? ?i ?1i ?体? ?t ?.?i? ： 0.5 0.2 2.5?i?iiguiu ?lii?m ?i?:?igugu? ?i?g?g? ?i?:2.5 = 2.50.125 = 0.1250.5 0.2 ?85418541= 2.541 ?i? ：0.5 = 0.1250.2 85= 0.125? 2.0 5.0 ： ?8541?1i ?1i ?. ? 2.0 5.0 ： ?8541?1i ?1i ?.?i? ?i?12?d.ti ?ti ?1? 1?i ?1i ?1i?灄? ?1i ? ?1 ?体?(.? ?1 ?1 ?1? ?.)2、3、4 ? 6?: ? ?1i ?1i