有甲、乙两根绳子,将甲绳子先剪去全长了 2 5 ,再剪去 2 5 米;将乙绳子先剪去

2025-05-15 02:34:14
推荐回答(1个)
回答1:

是甲是x米,乙是y米,
x(1-
2
5
)-
2
5
=(y-
2
5
)(1-
2
5
),
3
5
x-
2
5
=
3
5
y-
6
25

3
5
x-
2
5
-
3
5
y=
3
5
y-
6
25
-
3
5
y,
3
5
x-
3
5
y-
2
5
+
2
5
=
2
5
-
6
25

3
5
(x-y)=
4
25

x-y=
4
15

所以x>y.
故选:C.