设甲队植树x棵,则乙队植树5/4·x(棵),丙队植树7/6·x(棵)x+5/4·x+7/6·x=69712x+15x+14x=836441x=8364x=204即:甲队植树204棵,则乙队植树5/4×204=255(棵),丙队植树7/6×204=238(棵)
乙转换成甲:1/2÷2/5=5/4现丙转换成甲:1/3÷2/7=7/6甲:697÷(1+5/4+7/6)=204(棵)乙:5/4×204=255(棵)丙:7/6×204=238(棵)