用加减乘除把下面2组数凑成24 (4,7,8,9)(5,6,7,7)

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用加减乘除把下面2组数凑成24 (4,7,8,9)(5,6,7,7)

用加减乘除把下面2组数凑成24 (4,7,8,9)(5,6,7,7)
用加减乘除把下面2组数凑成24 (4,7,8,9)(5,6,7,7)

用加减乘除把下面2组数凑成24 (4,7,8,9)(5,6,7,7)
9-8=1,7-1=6,4X6=24
7/7=1,5-1=4,4X6=24