數學問題cm化做吋

54cm = 21.264"
109cm = 42.917"
148cm = 58.264"

1cm = 0.393701吋

1)54cm = 54 x 0.393701 = ~21.26吋
2)109cm = 109 x 0.393701 = ~42.91吋
3)148cm = 148 x 0.393701 = ~58.27吋

~ 系around/大約既意思,因為有好長小數位

如果你系一個學生,你e家要學cm轉吋,就用以上方法啦,如果唔系,你可以入以下個網,我一直都用開,系一個幾好既單位轉換既web site, 我都介紹左比好多同事/朋友用,同post過系yahoo知識+
http://www.digitaldutch.com/unitconverter/

其實 1吋(inch) =2.54厘米(cm)

所以,

1) 54cm / 2.54cm = 21.26inch
2) 109cm / 2.54cm = 42.91inch
3) 148cm / 2.54cm = 58.27inch

1吋 = 2.54 cm
(1)54cm = 21.26 吋 (2位小數點)
(2)109cm = 42.91吋(2位小數點)
(3)148cm = 58.27吋(2位小數點)

希望你會明喇~~~good luck 呀