括号1⼀6-2⼀7+2⼀3括号除以括号-5⼀42括号

2024-11-15 15:08:03
推荐回答(1个)
回答1:

=(1/6-2/7+2/3)×(-42/5)
=-(42×1/6-42×2/7+42×2/3)/5
=-(7-12+28)/5
=-23/5