问题描述：
1/5×12÷1/5= 0.25×12.5÷1/32= 2/3×4/9×
1/5×12÷1/5=
0.25×12.5÷1/32=
2/3×4/9×1/2=
6.9+3.1-6.9+3.1=
1÷1/2-1/2÷1=
3/5+3/5÷3/5+3/5=
1÷1/7×1÷1/7=
4/5×4/5÷4/5×4/5=
1/5×12÷1/5=
0.25×12.5÷1/32=
2/3×4/9×1/2=
6.9+3.1-6.9+3.1=
1÷1/2-1/2÷1=
3/5+3/5÷3/5+3/5=
1÷1/7×1÷1/7=
4/5×4/5÷4/5×4/5=
问题解答：
我来补答展开全文阅读