〔3/5+7/10〕÷13/5-0.6×0.6
=〔3/5+7/10〕×5/13-0.36
=3/5×5/13+7/10×5/13-0.36
=3/13+7/26-0.36
=13/26-0.36
=0.5-0.36
=0.14