把一个高为5厘米的圆柱从直径处沿高剖成两上半圆柱，这两个半圆柱的表面积比原来增加80平方厘米，求原来圆柱的表面积．
直接写出得数．+=﹣= 3×=÷=+=÷= 1﹣=×=
直接写出得数．==== 2÷3====
+=﹣=×= 14÷=÷=×=÷= 6×=
直接写得数： 1﹣= 9×=÷2=÷== 1=×1.3=×=
直接写出下面各题的得数．÷=== 1.25×0.8=== 1﹣30%= 5.4÷0.3= 9﹣0.56=
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