1: 3/10 10 4/11 9/16
3/2 1/4 0 1/3
2: 3/2 40 2/39 32/9
1/3 3/50 1/3 32/9
3: 3/2 4/5 1/40
4: ﹙1﹚ 2/5÷2/3=3/25
﹙2﹚ 2/5×2/3=4/15
﹙3﹚ 2/3÷2/5=5/3
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