13/19除以5/7减6/13乘5/7等于多少
问题描述:
13/19除以5/7减6/13乘5/7等于多少
答
13/19除以5/7减6/13乘5/7
=13/19乘7/5减6/13乘5/7
=91/95减30/91
=8281/8645减2850/8645
=5431/8645