21/28 (求比值)

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21/28(求比值)21/28(求比值)21/28(求比值)7:12=7/124/3:8/5=5/61.08:0.96=108/96=9/85/1:3/1=5/30.8:0.28=80/28=20/7

21/28 (求比值)
21/28 (求比值)

21/28 (求比值)
7:12=7/12 4/3:8/5 =5/6 1.08:0.96 =108/96=9/8 5/1:3/1=5/3 0.8:0.28=80/28=20/7 0.4:4/1=0.4/4=0.1=1/10