簡算11/18x3/14x21/55

簡算11/18x3/14x21/55

11/18x3/14x21/55
=(11/18x21/55)x3/14
=7/30x3/14
=1/20
如果本題有什麼不明白可以追問,如果滿意請點擊“好評”