上海福山外国语小学 上海福山外国语小学 Shanghai Fushan Foreign Language Primary School Shanghai Fushan Foreign Language Primary School 第1 讲 方阵问题 三年级第二学期上海福山外国语小学 上海福山外国语小学 Shanghai Fushan Foreign Language Primary School Shanghai Fushan Foreign Language Primary School上海福山外国语小学 上海福山外国语小学 Shanghai Fushan Foreign Language Primary School Shanghai Fushan Foreign Language Primary School 方阵是由人或物排成的正方形，一般有 实心（图1）和空心（图2）两种形式。 图1 图2上海福山外国语小学 上海福山外国语小学 Shanghai Fushan Foreign Language Primary School Shanghai Fushan Foreign La
