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桃樹與蘋果樹之比4:5=12:15 蘋果樹與梨樹之比為3:2=15:10 所以三個的比是 12:15:10 桃樹 740÷(12+15+10)x12=240棵 蘋果樹 240÷4/5=300棵 梨樹 300x2/3=200棵
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