求解：六年级的五道分数简便计算题，好的追加悬赏！

Question

87分之91*90
53又15分之6/9
64又6分之1/7
9又2分之1+99又2分之1+999又2分之1+9999分之2分之1

Answer 1

87分之91*90
=(1+4/87)*90
=90+360/87
=93又4/29
53又15分之6/9
=(54-9/15)/9
=6-1/15
=5又14/15

64又6分之1/7
=(63+7/6)/7
=9+1/6
=9又1/6

9又2分之1+99又2分之1+999又2分之1+9999分之2分之1
=9+1/2+99+1/2+999+1/2+9999+1/2
=9+99+999+1+9999+1
=9+99+1000+10000
=11108本回答被提问者采纳

Answer 2

(91/87)*(87+3)=91+(3/87)
53((6/9)/15)=53+((6/9)/15)=53+2/45
64((1/7)/6)=64+1/42
=9+99+999+9999+1+1=11108