6/5*13/1+9/5*13/2+18/5*13/6简便运算

问题描述:

6/5*13/1+9/5*13/2+18/5*13/6
简便运算

6/5*13/1+9/5*13/2+18/5*13/6
=6/1*13/5+9/2*13/5+18/6*13/5
=(6/1+9/2+18/6)*13/5
=18/(3+4+6)*13/5
=18/13*13/5
=18/5