负1/63除以(3/14减1/3减1/7加2/9)

问题描述:

负1/63除以(3/14减1/3减1/7加2/9)

负1/63除以(3/14减1/3减1/7加2/9)
= -1/63÷(3/14-2/14-3/9+2/9)
= -1/63÷(1/14-1/9)
= -1/63÷(-5/126)
=2/5