题目内容
一件工作,甲单独做要用6小时,乙单独做要用4小时.甲做完
后,两人合作,还要几小时才能做完?
| 1 |
| 3 |
(1-
)÷(
+
),
=
÷
,
=
(小时),
答:还要
小时才能完成.
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| 3 |
| 1 |
| 6 |
| 1 |
| 4 |
=
| 2 |
| 3 |
| 5 |
| 12 |
=
| 8 |
| 5 |
答:还要
| 8 |
| 5 |
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