765-198=
0.16÷3.2=
-=
+2÷7=
1.4+8.56=
1÷10%=
0.125÷=
1÷×=
80×40%=
+25%=
20÷50%=
-12.5%=
35%×40=
160%-1.2=
升=毫升
4.030m3=m3dm3
问:这两条绳子原来的长度是多少厘米?