学校食堂地面要铺设地砖，如果用面积9平方分米的方砖，800块正好铺满，如果用边长是4分米的方砖，需要多少块？
= = = =3.14×5= = = == =
直接写出得数．1﹣40%= ll7%﹣1.02= +40%= ﹣24%=60×15%= 60÷80%= ×= ÷=
直接写得数．0.16+0.64=3﹣0.7=0.15×4=1.2÷0.3=1÷0.1=+=﹣=×=÷=12÷16=
直接写得数．1﹣= 1÷= ﹣=×= 0÷=
直接写得数×14= 1﹣= += ﹣=1÷= ×= ÷= 0.25﹣=0.125÷= ÷=
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