5.7.8.9怎麽組合成24

8*((5-9)+7)

(8*5)-(9+7)

((8*5)-7)-9

(8*5)-(7+9)

8*((5+7)-9)

8*(5+(7-9))

8*(7-(9-5))

8*((7-9)+5)

8*((7+5)-9)

8*(7+(5-9))

(7-(9-5))*8

((7-9)+5)*8

((7+5)-9)*8

(7+(5-9))*8