列式计算7k4E/J2P(T
6的8倍是多少？7k4E/J2P(T
算式：提示6j/n3{7M9K*L7k4E/J2P(T
7个5是多少？7k4E/J2P(T
算式：提示'U2j3F;@.v7k4E/J2P(T