中间是乘号a=25三次方/522=15625/522b=36/25c=29/25中间是加号式2 - 式1 =>(a+b+c+c)-(a+b+c) = 58-50 => c=8式3 - 式1 =>(a+b+b+c)-(a+b+c) = 72-50 => b=22=> a+b+c = a+22+8 = 50 => a=20