小学数学 人教版数学三年级下册《口算乘法》课件之二 维语

1、1?r?al?: :40404= 304= 303= 2003= 2008= 8= 12124= 134= 133= 113= 115= 5= 160160909016001600484839395555l敬潃潬湯t ?潬?la2?r?al?: :3 3luri ?4t ?4?( ).( ).3030?4?( )( )luri ?4t. .300300?4?( )( )luri 潃?. .6060?4? ( ) ( )luri ?4t. .9 9luri ?4t ?4?( ).( ).3 3luri 30 30?4?( ).( ).30303 33 36 690909090l敬潃潬湯t ?潬?

2、la3?潬?敬4 ?1? ?l? ii4?. .?1i? ?潬?潬a? ? ?1? 81? 8? ? ?it.? ?1? ?t?t ? ? 3008? ? ?1 608? ?-?8 ?it.?.l敬潃潬湯t ?潬?la41.?4潬?敬410?iu?a ?潬潬敬u? ?潬潃湯 ?ii?ti?8? ?1? ?t?t ? ? 3008? ? ?1 608? ?-?8 trit.?.?1i? ?潬?潬al敬潃潬湯t ?潬?la5?llt lr潬u?a r?4t ?湯 ?l潬? 400l敬? ?潬潃湯 ?敬?l潬i? ?敬潬?4?500500l敬? ?潬潃湯 ?敬?l潬i4? ?敬潬?4?1i? ?潬?

3、潬a?4潬?敬410?iu?a ?潬潬敬u? ?潬潃湯 ?ii?l敬潃潬湯t ?潬?la6?ti?8? ?1? ?t?t ? ? 3008? ? ?1 608? ?-?8 trit.?.?4潬?敬410?iu?a ?潬潬敬u? ?潬潃湯 ?ii?1i? ?潬?潬al敬潃潬湯t ?潬?la7?1i? ?潬?潬a?ti?8? ?1? ?t?t ? ? 3008? ? ?1 608? ?-?8 trit.?.?4潬?敬430?iu?a ?潬潬敬u? ?潬潃湯 ?ii?l敬潃潬湯t ?潬?la8?llt lr潬u?a r?4t ?湯 ?l潬? 200 200l敬? ?潬潃湯 ?敬?l潬i? ?敬潬?4

4、?lr潬u?a ?湯r?4t ?l潬?60 60 l敬? ?l? ?敬?l潬i? ?敬潬?4? 50 50l敬? ?l? ?敬?l潬i? ?敬潬?4?4潬?敬430?iu?a l敬u? l敬? ?潬潃湯 ?u敬l l敬? ?l? ?ii?1i? ?潬?潬al敬潃潬湯t ?潬?la9?潬a ?lt ?a?t808010= 5010= 5060= 60= 70070010 = 20010 = 20040= 40= 404060 = 8060 = 8050 = 50 = 313120= 6020= 6090=90=8008003000300070007000800080002400240040004

5、00062062054005400l敬潃潬湯t ?潬?la10l敬潃潬湯t ?潬?la?u潬l潬潬? ?潬?潬i潬t?ll 8 8?4l ?敬4 ?潬i潬潬a?l 20 20?u?1 6 6?4l ?敬4 ?潬i潬潬a?l 30 30?u ?ll潬?r1潬?湯. .?潬tlly l敬u? ? ?潬i潬? ?湯a11 4040( ) = 12000( ) = 12000300300l敬潃潬湯t ?潬?la?ul潬潬? ?潬?l湯a12 4040( ) = 12000( ) = 12000( )( )70 = 490070 = 49003003007070l敬潃潬湯t ?潬?la?ul潬潬? ?潬?l湯a13（ ）（ ）= 2400= 2400（40 40 ）（6060）= 2400= 2400（400400）（6 6）= 2400 = 2400 （600600）（4 4）= 2400= 2400（3030）（8080）= 24