同分母分数加、减法(25)

1、?r?al?11?riila?l?r1?l1r? ?11?riila?ra?r?l?r1?l1r?r?al?ar1?1?a?a?a?a1a1? 1878（1 1） 的分数单位是（的分数单位是（ ）1959（2 2） 里面有（里面有（ ）47（3 3） 里面有里面有4 4个（个（ ）5173515（4 4）3 3个个 的和是（的和是（ ）1?r?11?riila?ra?r?r?1rar?l?r1?r?1rar?l?r1?l?r1?r?ir1?rr?a1raa?r?1rar?l?r1?l?a1raa?2737？?ir1?i?ir?a?1r?r0?ir?a王老师拿来一张硬纸王老师拿来一张硬纸,做数字

2、卡片用了这张纸做数字卡片用了这张纸的的 ,做试题卡片用了这张纸的做试题卡片用了这张纸的 ,一共用了一共用了这张纸的几分之几这张纸的几分之几?3727?r?rala1?r?la?r?0l?l?r?a?r?i?ir?a?rii? ?1r?r0?ir?a?rii?la?lir?ia1?1l?ra?lir?a?la?r?0l?l?r1raal?riraal?a1?al?r?例题例题37 和和 的分母相同，也就是它们的分数单位的分母相同，也就是它们的分数单位相同，可以把相同，可以把3个个 和和2个个 直接加起来，是直接加起来，是5个个 也就是也就是 27171717573727 327 57?l1?a1

3、?l1?l瀀0耀?r?i?a1raaia?11?riila?lr?a?i?aia?aaia?i?1?l?aar?i?ar?r?r?i?r?irr?r?lrril1?lr?r?r?l1?l?i?1?r?la?11?riila?a1r?ra?r?r?0耀?l?l?r1?lr?l?r1?0耀?r?ii1?l?r1?l?a1raa?a10ri?lir?rr?37+27=4919+=12251125+=57592325785878585 7812832?l?l瀀?riila?a?a1?a?r0?112?lrrr1?r?r?l?r1?rir?rir?rir?r?rr1raa?r?rir?1?rir?11?

4、riila?1rali?0r1r0?r?1?riila?l?1?l?l瀀?riila?a?i?a?a1?a?0r1r0?r?rir? 王老师拿来一张硬纸，做数字卡片、式题卡片一共用了这张纸的 ，做数字卡片用了这张纸的 ，做式题卡片用了这张纸的几分之几？37575737?ir1?r?rala1?r?la?r?0l?l?i?r?ir?a?1r?r0?ir?a?rii?1l?a?r?0l?l?la?lir?i?ir?a?i?a?a?r?0l?l?la?lir?iaa?1r?r0?ir?a?a?a?r?0l?l?r1raal?riraal?la?lir?ir15737 537 27?r?i?a1r?r

5、?r?l1?a1?l1?l瀀0耀?11?riila?r?lr?a?i?r?ir?ir?l1?l?i?1?l?r?r?aar?r?i?ir1?rr?lr?r?a?ar1rar?r?a?aaia?rr?l?l?r?raaaaia?r?r1rr1l?r?ri?rr?r?r?r?l1?11?la?riila?0耀?r?l1?r1?ri1?r?i?a1?l1?l瀀0耀?a1raaia?r?r?r?l1?11?la?riila?0耀?r?l1?r1?a?r?i?a1?l1?l瀀0耀?a1r?r?r?r?r?l1?11?la?riila?0耀?r?aia?l1?ir?r?i?a1?l1?l瀀0耀?0耀?r?

6、a1raaia?a1r?r?a耀?rr?lrar1?a1r?1?ia1?r?r0?11?riila?r?ir?ir?l1?ia1?aar?i?ar?r?r?i?rr?r1l?11?riila?r?iaia?ir?l1?ia1?aar?i?ar?r?r?i?rr?r1l?）?r?r?r?l1?11?la?riila?0耀?r?aia?l1?ir?r?i?a1?l1?l瀀0耀?0耀?r?a1raaia?a1r?r?27472 47 761437（）（）（）? ?11?riila?aia?r?ir?ir?l1?lr?a?i?aia?r?ir?ir?l1?i?1?lr?r?11?riila?ra?r?

7、i?1?r?ri?r?r11?a?r?r?r?a?raar?r?（ ） ?a?ia1?aar?r11r?1l?a?51131181151819+3747= 714=1299+7929=91119=11191119106+5656=（ ）（ ）（ ）（ ）?ra?r?a1?la?1?a?a?a?a1a1?（?）（）（?）?（?）?（?）?0?0?（?）（）（?）（）（?）?0?（?）?（?）?0?0?0?( )( )( )( )?0?（?）?（?）?( )( )( )( )?（?）?（?）?0?0?l?1ri?r?la?l?rali?r?r0?a831858883?lir?rr?3434+=35

8、255878+=一、一、 11 21455= 1?lir?rr?75735453 1183 4 39894 2?air?rr?1458387929590 512 512761647 715-=-5616=1-37=1- 115- 715=?a?raar?i?1?1r?ra?rr?r?r?ri?ar?1r?1?raa?aa?r?a?ri?i?ar?r?ri?araa?a?1?r?r?i?rr?r?raa?aa?r?a?ri?i?ar?r?ri?araa?a?1?r?r?i?a1?l?r?a?aar?ar?a?a瀀?araa?a?1?r?araa?a?1?r1raal?riraal?a1?l?r?r1l?lrril1?l?rr?r?r?r1?ar?a?a0a?aaa?r?a?r?r1?la?lir?ia1?l?l?la?r?r1?ri?a? 9 10?r?r1?ra?li?r?r1? 6 10?ri?ra?r?r1? 9 10 6 10 3 10（ ?r?r1?）9 106 10?r?r10r?rr?11?riila?ra?r?a1?l?1a?r?1?riila?lr?l?rara?r?1?r?riila?ir1?rr?ir1r?la?a1raa?19?0r?la1?ril1