(4-7)*(5-13)(5+(7*13))/4(5-13)*(4-7)(5+(13*7))/4(7-4)*(13-5)((7*13)+5)/4(13-5)*(7-4)((13*7)+5)/4
(13×7+5)÷4=24(13-5)×(7-4)=24
(7-4)*(13-5)=24
【(7x13)+5】÷4=24