一英尺等于12英寸 4*12*6*12/[(2/4)*(2/4)]=13824(块) 需要13824块瓷砖
60*40/2^2=600块
“周长2英寸”!4×12×6×12÷(0 .5×0.5)=13824
4×12×6×12÷(0 .5×0.5)=13824