把42支钢笔平均放在7个盒子里，每个盒子放几支钢笔？*R4Z8r8P'u1U5_
算式：提示(k'R+e,D1v:T*Y*R4Z8r8P'u1U5_
答：每个盒子放'U+n-E/_/J4P-S;@9V'n支钢笔。*R4Z8r8P'u1U5_