一条公路长50千米,修了30天,还剩10千米.
①已修的占全长的百分之几
(50-10)÷50
=40÷50
=80%
②剩下的比已修的少百分之几
(50-10-10)÷(50-10)
=30÷40
=75%
③已修的比剩下的多百分之几
(50-10-10)÷10
=30÷10
=300%
④已修的是剩下的百分之几
10÷(50-10)
=10÷40
=25%
⑤剩下的比全长少百分之几
(50-10)÷50
=40÷50
=80%
一条公路长50千米,修了30天,还剩10千米.
①已修的占全长的百分之几
(50-10)÷50
=40÷50
=80%
②剩下的比已修的少百分之几
(50-10-10)÷(50-10)
=30÷40
=75%
③已修的比剩下的多百分之几
(50-10-10)÷10
=30÷10
=300%
④已修的是剩下的百分之几
10÷(50-10)
=10÷40
=25%
⑤剩下的比全长少百分之几
(50-10)÷50
=40÷50
=80%