塑料桶可以养金鱼吗鱼缸有点小有个大的方的塑料桶 鱼儿离不开水，用一个底面半径为20cm，高为45cm的圆柱形...
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56520\u00f7120\u00f740=11.775\uff08\u5398\u7c73\uff09
\u9c7c\u7f38\u91cc\u7684\u6c34\u4f1a\u5347\u9ad811.775\u5398\u7c73\u3002
\u4f60\u597d\uff1a
\u6c34\u7684\u4f53\u79ef\uff1a
3.14\u00d720²\u00d745
=1256\u00d745
=56520\uff08\u7acb\u65b9\u5398\u7c73\uff09
\u517b\u9c7c\u7f38\u5e95\u9762\u79ef\uff1a
120\u00d740=4800\uff08\u5e73\u65b9\u5398\u7c73\uff09
\u9c7c\u7f38\u91cc\u7684\u6c34\u4f1a\u5347\u9ad8\uff1a
56520\u00f74800=11.775\uff08\u5398\u7c73\uff09
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