1÷1又1/2÷1又1/3÷1又1/4÷.1又1/20(巧算)

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/11 12:43:32
1÷1又1/2÷1又1/3÷1又1/4÷.1又1/20(巧算)

1÷1又1/2÷1又1/3÷1又1/4÷.1又1/20(巧算)
1÷1又1/2÷1又1/3÷1又1/4÷.1又1/20(巧算)

1÷1又1/2÷1又1/3÷1又1/4÷.1又1/20(巧算)
1÷1又1/2÷1又1/3÷1又1/4÷.1又1/20
=1÷3/2÷4/3÷5/4÷.÷21/20
=1×2/3×3/4×4/5×.20/21
=2×20/21
=40/21