如图，做一个无盖的圆柱形铁片水桶，至少需要多大面积的铁皮？
直接写得数．×=﹣=×=×=÷=÷=÷=÷=
直接写得数÷=×=﹣=×1.4= 12×= 24×=+= 0÷=
直接写得数== 3÷========
直接写得数．×16= 12÷= 0.3×=×÷=÷= 0×+=×÷×=
口算． 2×= 1.5÷=×0.8=×9= 1.2÷=÷2=÷= 2.4÷= 1÷5=÷3=
×
﹣
=
×
=
×
=
÷
=
÷
=
÷
=
÷
=
÷
=
×
=
﹣
=
×1.4=
= 24×
=
+
= 0÷
=
=
= 3÷
=
=
=
=
=
=
=
=
×16= 12÷
= 0.3×
=
×
÷
÷
= 0×
+
=
×
÷
×
= 1.5÷
=
×0.8=
×9= 1.2÷
=
÷2=
÷
= 2.4÷
= 1÷5
=
÷3=
粤公网安备 44130202000953号