(-1⼀42)⼀[(1⼀6)-(2⼀7)+(2⼀3)-(3⼀14)]+[(1⼀6)-(2⼀7)+(2⼀3)-(3⼀14)]⼀(-1⼀42)=( )求过程。

2024-11-16 08:58:03
推荐回答(1个)
回答(1):

(-1/42)/(1/6-2/7)+2/3+3/14
=(-1/42)/(7/42-6*2/42)+2/3+3/14
=(-1/42)/(-5/42)+2/3+3/14
=1/5+2/3+3/14
=3/15+2*5/15+3/14
=13/15+3/14
=(13*14+3*15)/(15*14)
=227/210