甲:乙 = 2/5:1/2 = 4:5 = 12:15
甲:丙 = 2/7:1/3 = 6:7 = 12:14
甲:乙:丙 = 12:15:14
所以 甲种了 12×697÷(12+15+14) = 204(棵)
同样的,乙种了 15×697÷(12+15+14) = 255(棵)
丙种了 14×697÷(12+15+14) = 238(棵)
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甲:乙 = 2/5:1/2 = 4:5 = 12:15
甲:丙 = 2/7:1/3 = 6:7 = 12:14
甲:乙:丙 = 12:15:14
所以 甲种了 12×697÷(12+15+14) = 204(棵)
同样的,乙种了 15×697÷(12+15+14) = 255(棵)
丙种了 14×697÷(12+15+14) = 238(棵)
--------------------
梳理知识,帮助别人,愉悦自己.
“数理无限”团队欢迎你