甲、乙、丙三人去完成植树任务，已知甲植一棵树的时间，乙可以植两棵树，丙可以植三棵树．他们先一起工作了5天，完成全部任务的
，然后丙休息了8天，乙休息了3天，甲没休息，最后一起完成任务．问：从开始植树算起，共用了多少天才完成任务？
相关试题
×
= 
÷6= 
÷
= 1÷
×
= 
﹣
= 
+
= 6÷
=
= 
= 
= 
=
= 
÷
= 0.25×3.2×4= 32×（1﹣0.99）=
÷
×
÷
= 1.25×8= 2.9+6.1= 
+
=
÷
= 
×
= 25÷75= 
÷
=
= 5÷
=直接写出得数．
①
×4= ②0.5+1= ③3
×
= ④2﹣0.7=
⑤2÷0.7= ⑥3.5﹣﹣2
= ⑦6×（
+）= ⑧5.5×4+5.5×6=
⑨4
﹣（+1
）= ⑩4
÷4=
×15= 
= 87﹣32= 0.62= 
= 
×
= 
﹣
= ．
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