小學數(shù)學 三年級上冊《秒的認識》PPT課件 維語 (9)

1、1義務教育課程標準實驗教科書小學數(shù)學三年級上冊義務教育課程標準實驗教科書小學數(shù)學三年級上冊 2 27 : 30 ?eveni ?eeet7 : 45 ?ri?lr? ?e0?r3?e? ?rere0ler 6?ev 9 ?0 ?e0?r 3 ?0t ?n ?ra?15?e? ve?0.45 - 30 = 15，15 ?e?e?er ?0i ?e?0 ea? ?e?ee? ?eveni ?ri?lr? ?e0et? ?lle? ?v?r42. ?i?t?f 8:40 ?li0 ?e ?e0et? ?.?r?i?ael ?l?ael?i 9 : 00 ?e?ei ?et?i?r8 : 00 ?e?

2、ei ?l9 : 00 - 8 : 40 = 20(?e?)?a:? ?e 20?e? ?e?0?r ?i?r. 9 ：0 0 8 ：4 0 8 ：6 0 8 ：4 02 091? ?lni ?e0?i 60 ?iv e?e?52 ?i?r = ( )?e? 1120?e ?i?r 60?rrei?e? ?i?r ?r?0 60? 60 ? ?懷?r?0?120?el?e? ?l ve?0.?l? ?.?r?f6180240 ?0?ei ?ee?: 3?i?r=（ ）?e? 4?i?r=（ ）?rr7 ?e?e0r? ?aetei “” ?v?0l.9 9?e? 9090?rer 4 4?i?

3、r 2424?e?5 5?i?r 500500?rer 140140?rer 2 2?e? 960=540?灄460=240?a560=300?a30060=18000?灄260=120?灄8( ( ) )( ( ) )( ( ) )( ( ) )35 ?e?35 ?e?20 ?e?25 ?e?2554 504150512401111 : 20: : : : : 93. 5.?e ee0i ive0r?i 11:20 iv ?el?e ?e0?r ?lri?r ?e?f 25?e? ?lrt?r ?l?v?i i ?i?r ivett? ?el?e ?ve0?r104.?褘?焛虈?焛 ?褘?褘

4、 ?褘? 400?焛 ?焛?褘 ?焛?吠?.?褘?褘?2 ?虈?43?虈? ?焛焛? ?褘?2?虈?34?焛焛虈? ?吠吠 ?褘? ?褘?褘? ?褘虈? ?虈? ? ? ?焛?43-34=9(?虈?)11：?ele?a?r ?i0r?褘? ?褘褘? ?焛? 15?虈 ?褘? 5? ?虈? ?褘虈?l焛? 7:35?焛 ?焛? ? ?焛?褘虈?褘? ? ?褘褘? ? ?褘?虈 ?吠? ?12 ?e ?r ?re?ve? v?i?i ?0?enr ?er?i ?e?0el?e ?l? ?l?i ?eaa?l ?v?e ?aeni ?e?r?rlel?r ?ee?i ?a?e0?r nrt?i ?e? li?ti.i ?e?ev?i?i ?rev?0? ?revel? ?l?i ?0eaa?l ?nr nr ?e?e?nr?lie?ee? ?ele?e0i ?l ?a?ev?i?i :?1?i ?r ?reva?t?e ?ereaa?l ?r?i ?rl?i ?e?e?e0?r?t ?re?f ?0i ?r?