刘大叔家在平地挖了一个圆柱形的沼气井,底面周长是18.84m,深3m。挖出 废水处理厂要挖一个底面周长是18.84m的圆柱形水池,要是他...
\u5468\u957f\u662f18.84m,\u6df13m\u3002\u6bcf\u7acb\u65b9\u7c73\u6709\u6ce5\u571f700kg,\u6316\u8fd9\u4e2a\u6cbc\u6c14\u4e95\u4e00\u5171\u6316\u51fa\u6ce5\u571f\u591a\u5c11\u7acb\u65b9\uff1f\u7531\u5706\u5f62\u7684\u5468\u957f\u516c\u5f0f\u53ef\u6c42\u5f97
\u5706\u67f1\u5e95\u9762\u534a\u5f84\uff1d\u5468\u957f\u00f7\u03c0\u00f72\uff1d18.84\u00f72\u03c0
\u7531\u5706\u5f62\u7684\u9762\u79ef\u516c\u5f0f\u53ef\u6c42\u5f97
\u5706\u67f1\u7684\u5e95\u9762\u79ef\uff1d\u534a\u5f84²\u00d7\u03c0\uff1d(18.84\u00f72\u03c0)²\u00d7\u03c0
\u7531\u5706\u67f1\u7684\u4f53\u79ef\u516c\u5f0f\u53ef\u6c42\u5f97
\u5706\u67f1\u4f53\u79ef\uff1d\u5e95\u9762\u79ef\u00d7\u9ad8\uff1d(18.84\u00f72\u03c0)²\u00d7\u03c0\u00d73
\u03c0\u22483.14\u4ee3\u5165\u5f0f\u4e2d\u5373\u53ef\u6c42\u5f97\u6316\u51fa\u6ce5\u571f\u7684
\u4f53\u79ef\u2248[18.84\u00f7(2\u00d73.14)]²\u00d73.14\u00d73
\u6316\u51fa\u6ce5\u571f\u7684
\u91cd\u91cf\uff1d\u4f53\u79ef\u00d7\u5355\u4f4d\u4f53\u79ef\u7684\u91cd\u91cf
\uff1d[18.84\u00f7(2\u00d73.14)]²\u00d73.14\u00d73\u00d7700
\u6b64\u9898\u4e2d\u8ba1\u7b97\u51fa\u7684\u4f53\u79ef\u5355\u4f4d\u4e3am³\uff0c\u91cd\u91cf\u5355\u4f4d\u4e3a\u338f.
18.84\u00f73.14\u00f72\uff1d3
56.52\u00f7\uff083.14\u00d73\u00d73\uff09\uff1d2
挖土3.14×3×3×3=84.78(立方米)
84.78立方米
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