СРОЧНО ДАМ 58 БАЛЛОВ
5/4+(31/4+16/7)/5/9=5/4+(217/28+64/28)/5/9=5/4+281/28/5/9=35/28+281/28/5/9=316/28х9/5=63,2/28х9/1=578,8/28≈20,67