(54/6)*(56/7)-36/4+3*9
(54/6)*(56/7)-36/4+3*9=9*8-9+27=72-9+27=90
54:6=9 56:7=8 9*8=72 36:4=9 3*9=27 9+27=36 72-36=36 Ответ:36