.专练 51异分母分数运算(10 套,5 页,含答案)知识点:异分母分数相加减:先通分,把两个分数转化为同分母分数,然后分母不变,分子相加减。典型例题:1321②21③15④33⑤①+ =( )- ( )+( )+( )353293464 -5 ( )12313⑦32⑥41513115( )(⑧)(⑨)( )24681051281289109专练 52异分母分数运算115231 (⑩) (11)8 1 (12) (13)236342918511111 (14) (15)3 1 (16)-=(17)9321051535875158367(18)(19)(20)20201291392131375993614++=(21)() (22)10--(23)12125651688答案:答案:14151333511;;;;;答案:;:;;2;15691220101210511718222781139;;;;;答案:;;;;;答案:;;;9;6418695315613262..专练 53异分母分数运算31124-=( )497311512526+ =( )-=( )5-4=(27)96226231111+=(28)-=(29)+= (30)+=(31)9731024347373113332333411--( )- (- )( )-(-)=( )10101242248113 ()424(35)5-( 1- 1 )=(36)1 + 3 - 1 =(37)12122445专练 54异分母分数运算1514 511+=(38)- =(39)2+=(40)15+6=(41)6754271111131+=(42)+=(43)-=(44)-=(45)822389421747321312(46) () (47) () (48)15355151510452355321144++=(49)- + =(50)-( - )=(51)7579881511 15答案:答案:5341713411711154;;;;;答案:;;;10;;答案:;;;;3663320182120123826551851111511147215172;;;;;答案:;;;;;答案:;;;;12352108672415201511365..专练 55异分母分数运算21113273-=(52)+=(53)+=(54)-=(55)36838410323412141+=(56)-=(57)+=(58)- =(59)510727145104526073111 ()( )1-(61)(62)563756841-- =(121563)11115+- =(64)+ -2=(65)52533专练 56异分母分数运算2421111 1-=(66)-=(67)+= (68)5 9 (69)5105 610201170511111+ =( )+ =(71)+ =(72) (73)3683522684171432174++=( )-(+)=(75)-+(76)9119969494111111114++(77)+ -(78)++(79)523234525答案:答案:1112917151107192531;;;;;答案:;;;;;答案:;;;0...