能简便得要简便:(4⼀7+8⼀9)×2⼀25 (5⼀6-5⼀9)×18⼀5 1÷(1-3⼀4×8⼀9÷5⼀6) 19⼀20×[1÷(3⼀4+5⼀6)]

2024-11-22 20:58:10
推荐回答(2个)
回答1:

( 5/6-5/粗雀9)×18/5 1÷(1-3/4×8/旅消9÷5/6)
=(5/6×18/51-5/9×18/51)÷(1-3/4×8/9×6/5)
=(5/17-10/51)÷(1-4/5)
=(15/51-10/51)÷1/5
=5/51×5
=25/51

19/20×[1÷(3/4+5/6)]
=19/20×[1÷19/12]
=19/20×12/19
=3/5

(4/7+8/岩镇早9)×2/25 此式没有简便运算
(4/7+8/9)×2/25
=4/7×2/25+8/9×2/25
=8/175+16/225
=184/1575

回答2:

=4/7×2/25×9/9+8/9×2/25×7/7=184/1575