9-1⼀5-4⼀515⼀11+3⼀7-4计算下面各题怎样算简便就怎样算?

2024-12-03 00:43:54
推荐回答(2个)
回答(1):

●9 - 1/5 - 4/5
=9 -(1/5 + 4/5)
=9-1
=8
●15/11 + 3/7 - 4
=1 + 4/11 + 3/7 - 4
=-3 + 28/77 + 33/77
=-3 + 61/77
= -2又16/77

回答(2):

(1)9-1/5-4/5
=9-(1/5+4/5)
=9-1
=8
(2)15/11+3/7-4
=105/77+33/77-308/77
=(105+33-308)/77
=-200/77。