5/17*13/19+6/17*5/19简便算法
问题描述:
5/17*13/19+6/17*5/19简便算法
答
5/17x13/19+6/17x5/19
=5/17x13/19+5/17x6/19
=5/17x(13/19+6/19)
=5/17x1
=5/17