用一根长36cm的铁丝围成一个正方形，面积是多少？用这根铁丝围成一个长12cm的长方形，它的面积是多少？
直接写出得数． 40×30= 90÷3= 100+25= 0÷8= 181÷2=+= 1﹣= 360÷6= 20×7= 79×2=
直接写出得数． 6.4﹣4== 0.25×12=== 4.8÷0.1===
直接写出得数． 0.83+0.27= 2.9×100= 50÷1000= ×10=0.7 80÷ =0.8+= 5.6+4= 0.13×1000=﹣0.35=
直接写出得数．+=﹣+=+=﹣=+=+=++=﹣=+= 3﹣﹣=
直接写出得数﹣=﹣=﹣=+=+=﹣=+=﹣=
+
= 1﹣
= 360÷6= 20×7= 79×2=
= 0.25×12=
=
= 4.8÷0.1=
=
=
+
=
﹣0.35=+=﹣0.35=
+
=
﹣
+
=
=
﹣
=
+
=
+
=
+
+
=
﹣
=
+
= 3﹣
﹣
=
﹣
=
﹣
=
﹣
=
+
=
+
=
﹣
=
+
=
﹣
粤公网安备 44130202000953号