7/11×7/8－5/12×7/11 1/15×13/17－8/17×1/15 递等式计算._数学解答

7/11×7/8－5/12×7/11 1/15×13/17－8/17×1/15 递等式计算.

人气：336 ℃　时间：2019-08-18 17:26:32

解答

7/11×7/8－5/12×7/11
=(7/8－5/12)×7/11
=11/24×7/11
=7/24
1/15×13/17－8/17×1/15
=(13/17－8/17)×1/15
=5/17×1/15
=1/51