(1)12÷(1-[1/7])
=12÷
6
7
=14(吨)
答:八月份用量是14吨.
(2)15÷(1-[5/8])
=15÷
3
8
=40(千克)
答:共有40千克.
(3)25×(1+[1/5])
=25×[6/5]
=30(朵)
答:红花有30朵.
(4)600×(1-60%)
=600×40%
=240(米)
答:还剩下240米没修.
故答案为:12÷(1-[1/7]),15÷(1-[5/8]),25×(1+[1/5]),600×(1-60%).
(1)12÷(1-[1/7])
=12÷
6
7
=14(吨)
答:八月份用量是14吨.
(2)15÷(1-[5/8])
=15÷
3
8
=40(千克)
答:共有40千克.
(3)25×(1+[1/5])
=25×[6/5]
=30(朵)
答:红花有30朵.
(4)600×(1-60%)
=600×40%
=240(米)
答:还剩下240米没修.
故答案为:12÷(1-[1/7]),15÷(1-[5/8]),25×(1+[1/5]),600×(1-60%).