一堆圆锥形沙堆，底面周长是6、28米，高是90厘米，每立方米沙重2吨，这堆沙约有多少吨？用一辆载重
\u4e00\u4e2a\u5706\u9525\u5f62\u6c99\u5806 \u5e95\u9762\u5468\u957f\u662f6.28\u5398\u7c73 \u9ad8\u662f1.5\u7c73 \u6bcf\u7acb\u65b9\u7c73\u6c99\u7ea6\u91cd1.8\u5428 \u8fd9\u5806\u6c99\u91cd\u591a\u5c11\u5428\uff1f\u6c99\u5806\u7684\u91cd\u91cf\uff1d\u5706\u9525\u7684\u4f53\u79ef\u00d71.8
\u5706\u9525\u7684\u4f53\u79ef\uff1d1/3\u00d7\u5706\u9525\u7684\u5e95\u9762\u79ef\u00d7\u9ad8
\u5706\u9525\u7684\u5e95\u9762\u79ef\uff1d\u5e95\u9762\u534a\u5f84\u7684\u5e73\u65b9\u00d72\uff1d\uff08\u5e95\u9762\u5468\u957f\u00f7\u03c0\u00f72\uff09\u7684\u5e73\u65b9\u00d7\u03c0
\u628a\u6570\u503c\u5e26\u8fdb\u53bb\u5c31\u53ef\u4ee5\u5f97\u51fa\u6765\u4e86\uff0c\u5927\u7ea6\u662f2.826\u5428\u3002
\u534a\u5f84=6.28\u00f72\u00f73.14=1\u7c73
\u9ad8=90\u5398\u7c73=0.9\u7c73
\u6c99\u5b50\u91cd
=\u5706\u9525\u4f53\u79ef\u00d72
=\uff083\u5206\u4e4b1\u00d73.14\u00d71²\u00d70.9\uff09\u00d72
=1.884\u5428
~\u4e00\u523b\u6c38\u8fdc523\u4e3a\u4f60\u89e3\u7b54\uff0c\u795d\u4f60\u5b66\u4e60\u8fdb\u6b65~~~
~\u5982\u679c\u4f60\u8ba4\u53ef\u6211\u7684\u56de\u7b54\uff0c\u8bf7\u53ca\u65f6\u70b9\u51fb\u3010\u91c7\u7eb3\u4e3a\u6ee1\u610f\u56de\u7b54\u3011\u6309\u94ae~
~\u624b\u673a\u63d0\u95ee\u8005\u5728\u5ba2\u6237\u7aef\u4e0a\u8bc4\u4ef7\u70b9\u201c\u6ee1\u610f\u201d\u5373\u53ef~~
~\u4f60\u7684\u91c7\u7eb3\u662f\u6211\u524d\u8fdb\u7684\u52a8\u529b~~~
~\u5982\u8fd8\u6709\u65b0\u7684\u95ee\u9898\uff0c\u8bf7\u53e6\u5916\u5411\u6211\u6c42\u52a9\uff0c\u7b54\u9898\u4e0d\u6613\uff0c\u656c\u8bf7\u8c05\u89e3~~
2/2=1m
1*1*3.14=3.14平方米
90cm=0.9m
3.14*0.9*2=5.652吨
5.652/1.2≈5次
沙堆底面半径=6.28/(2*3.14)=10米 沙堆底面面积=3.14*10*10=314平方米
沙堆体积=0.9*314=282.6立方米
沙堆质量=282.6*2=565.2t
565.2/1.2=471次
绛旓細6.28/3.14=2m 2/2=1m 1*1*3.14=3.14骞虫柟绫 90cm=0.9m 3.14*0.9*2=5.652鍚 5.652/1.2鈮5娆
绛旓細杩欎釜娌鍫嗙殑搴曢潰鍗婂緞 =6.28梅2蟺 =1绫筹紝鈭甸珮鏄320鍘樼背=3.2绫筹紝鈭磋繖涓鍦嗛敟褰㈡矙鍫鐨勪綋绉槸 =(1/3)x蟺x1^2x3.2 =(1/3)x3.14x1x3.2 鈮3.349绔嬫柟绫筹紝鈭垫瘡绔嬫柟绫虫矙閲2鍚紝鈭磋繖鍫嗘矙鏈:2x3.349=6.698鍚ㄣ
绛旓細鍦嗙殑鍛ㄩ暱C=2蟺 r,宸茬煡鍦嗛敟搴曢潰鍛ㄩ暱,鍙眰鍑哄叾鍗婂緞=6.28梅3.14梅2=1绫.鍦嗛敟鐨浣撶Н=搴曢潰绉(鍗冲簳闈㈠渾鐨勯潰绉)脳楂樏1/3,涔熷氨鏄疺=蟺 r脳h脳1/3 =3.14脳1脳1.2脳1/3=1.256绔嬫柟绫抽暱鏂逛綋鐨勪綋绉=闀棵楀脳楂, 鍥涗釜閲忕煡閬撲换鎰忎笁涓氨鍙眰鍙﹀涓涓.鈫掗暱=浣撶Н梅瀹矫烽珮娉ㄦ剰缁熶竴鍗曚綅,2...
绛旓細娌欐哗鐨搴曢潰鍗婂緞锛6.28/(2*3.14)=1绫 娌欐哗鐨勪綋绉細(1/3)*3.14*1*1*1.2 = 1.256 绔嬫柟绫 鑳介摵锛1.256/(5*0.02)=12.56 绫
绛旓細搴曢潰鍗婂緞=搴曢潰鍛ㄩ暱梅2梅3.14=6.28梅2梅3.14=1绫 鍦嗛敟浣撶Н=3鍒嗕箣1脳搴曢潰绉楅珮 =3鍒嗕箣1脳3.14脳鍗婂緞鐨勫钩鏂姑楅珮 =3鍒嗕箣1脳3.14脳1脳1脳6 =6.28绔嬫柟绫 鍫嗙殑鍘氬害=6.28梅5梅4=0.314绫 涓涓鍦嗛敟褰㈡矙鍫嗗簳闈㈠懆闀挎槸6.28绫 楂樻槸6绫虫妸杩欏爢娌欏掑湪闀5绫 楂4绫崇殑娌欏潙閲 鍙互鍫0....
绛旓細鍗婂緞锛6.28梅3.14梅2=1 娌欏爢浣撶Н锛3.14*1*1*1.2梅3=1.204 鍧戜綋绉細6*3*0.05=0.9 娌欏爢浣撶Н澶т竴浜涳紝鎵浠ュ浜嗐
绛旓細鍦嗛敟鍗婂緞=6.28梅2梅3.14=1绫 璺殑鍘氬害=3梅10=0.3绫 閾虹殑璺濈 =锛3鍒嗕箣1脳3.14脳1²脳0.9锛壝凤紙4脳0.3锛=0.942梅1.2 =0.785绫 寰堥珮鍏翠负浣犺В绛旓紝绁濅綘瀛︿範杩涙锛併愭暟瀛﹁緟瀵煎洟銆戜负浣犺В绛攡~濡傛灉浣犺鍙垜鐨勫洖绛旓紝璇风偣鍑讳笅闈㈢殑銆愰変负婊℃剰鍥炵瓟銆戞寜閽紝璋㈣阿~~濡傛灉杩樻湁鍏朵粬闂闇瑕...
绛旓細6銆佷竴涓渾閿ュ舰鐨勯搮閿,搴曢潰鐩村緞鏄8鍘樼背,楂7.5鍘樼背,杩欎釜閾呴敟浣撶Н鏄灏?7銆佷竴涓鍦嗛敟褰㈡矙鍫, 搴曢潰闈㈢Н12骞虫柟绫,楂2绫,姣忕珛鏂圭背娌欓噸1.7鍚,鐩栨埧鐢ㄥ幓杩欏爢娌欑殑 ,杩樺墿涓嬪灏戝惃?8銆佷竴涓渾閿ュ舰璋峰爢, 搴曢潰鍛ㄩ暱18.84鍒嗙背锛岄珮2绫; 姣忕珛鏂圭背璋烽噸550鍗冨厠,杩欏爢绋昏胺閲嶅灏戝崈鍏?9銆佷竴涓渾閿ュ舰鐨勬紡鏂,瀹...
绛旓細浣撶Н=1/3脳3.14脳(6.28梅3.14梅2)^2脳6=6.28绔嬫柟绫 鑳介摵=6.28梅(10脳10)=0.0628绫
绛旓細娌欐哗鐨勫簳闈鍗婂緞锛6.28/(2*3.14)=1绫 娌欐哗鐨勪綋绉細(1/3)*3.14*1*1*6= 6.28绔嬫柟绫 20鍘樼背=0.2绫 鑳介摵锛6.28梅(8*0.2)= 3.925绫
