挖一个圆柱形蓄水池,底面直径为12米,深1.5米水池占地面积多少平方米?需挖土多少立方米?在水池四周侧面 砌一个圆柱形水池,底面周长是25.12米,深2米,(1)这个...
\u6316\u4e00\u4e2a\u5706\u67f1\u5f62\u84c4\u6c34\u6c60\uff0c\u5730\u9762\u76f4\u5f8412\u7c73\u6df11.5\u7c73\uff0c\u6c34\u6c60\u5360\u5730\u9762\u79ef\u662f\u591a\u5c11\u5e73\u65b9\u7c73 \uff08\u7b972\u53f7\u95ee\u9898\uff09 2\u9700\u6316\u571f\u591a\u5c11\u7acb\u65b9\u7c73 3\u5706\u67f1\u4f53\u4f53\u79ef\u7b49\u4e8e\u5e95\u9762\u79ef\u4e58\u4ee5\u9ad8\u3002
169.6460
1\u3001\u5360\u5730\u9762\u79efS1=\u03c0r^2=\u03c0*\uff0825.12/2\u03c0\uff09^2=50.24(cm^2)
2\u3001\u62b9\u6c34\u6ce5\u7684\u90e8\u5206S2=50.24+25.12*2=100.48(cm^2)
3\u3001\u8fd9\u4e2a\u6c34\u6c60\u80fd\u88c5\u6c34V=S1*h=50.24*2=100.48(cm^3)
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\u5706\u67f1\u4e2d\u53ef\u80fd\u6d89\u53ca\u7684\u516c\u5f0f\u6709\uff1a\u5e95\u9762\u76f4\u5f84d\uff0c\u5e95\u9762\u534a\u5f84r\uff0c\u5e95\u9762\u5468\u957fc\uff0c\u5706\u67f1\u9ad8h
\u5e95\u9762\u5468\u957fc=2\u03c0r=2\u03c0*\uff08d/2\uff09=d*\u03c0
\u5e95\u9762\u9762\u79efs=\u03c0r^2
\u5706\u67f1\u4f53\u79efV=\u5730\u9762\u9762\u79ef*\u9ad8=\u03c0r^2*h
2.其实就是蓄水池的侧面积:12π×1.5×10=565.2kg(π取3.14)
望采纳,有不会的问我~~
半径是6米,6×6×3.14×1.5是体积(挖土)
6×6×3.14+12×3.14×1.5×10(水泥)
绛旓細瑙e緱锛钃勬按姹犲簳闈鍦嗙殑鍗婂緞鏄細10/2==5锛堢背锛夎繖涓搫姘存睜鍗犲湴鐨勯潰绉槸锛3.14*5*5==78.5锛堝钩鏂圭背锛夎搫姘存睜鍐呰〃闈㈢Н鏄(鎶规按娉ョ殑闈㈢Н)锛78.5+3.14*10*2==141.3锛堝钩鏂圭背)钃勬按姹犵殑浣撶Н鏄(姘存睜鑳借鐨勬按鐨勯噺):78.5*2==157(绔嬫柟绫)157*1=157锛堝惃锛...
绛旓細鍗犲湴闈㈢Н灏辨槸搴曢潰绉紝涓姘存睜鐨勬繁鏃犲叧銆搴曢潰鍗婂緞锛5/2=2.5绫筹紝鍗犲湴闈㈢Н锛3.14*2.5*2.5=19.625骞虫柟绫炽
绛旓細瑙o細宸茬煡涓涓渾鏌卞舰钃勬按姹犲簳闈㈢洿寰勬槸20绫筹紝楂樻槸30绫筹紝寰楀簳闈㈠崐寰=搴曢潰鐩村緞梅2=20梅2=10绫筹紝璁捐繖涓按姹犲崰鍦伴潰绉槸x骞虫柟绫筹紝3.14脳锛10脳10锛=x x=3.14脳100 x=314 绛旓細杩欎釜姘存睜鍗犲湴闈㈢Н鏄314骞虫柟绫炽
绛旓細锛1锛3.14脳锛20梅2锛2=3.14脳100=314锛堝钩鏂圭背锛夌瓟锛氬畠鐨勫崰鍦伴潰绉槸314骞虫柟绫筹紟锛2锛3.14脳锛20梅2锛2脳2.5=314脳2.5=785锛堢珛鏂圭背锛夌瓟锛氬畠鐨勫绉槸785绔嬫柟绫筹紟锛3锛3.14脳20脳2.5+3.14脳锛20梅2锛2=157+314=471锛堝钩鏂圭背锛471骞虫柟绫=47100骞虫柟鍒嗙背47100梅16鈮2950锛堝潡锛夌瓟锛氬ぇ绾...
绛旓細1銆搴曢潰鍗婂緞锛20/2=10绫筹紝鍗犲湴闈㈢Н锛3.14脳10脳10=314骞虫柟绫 2銆314脳2=628绔嬫柟绫 3銆314+3.14脳20脳2=314+125.6=439.6骞虫柟绫
绛旓細鎶规按娉ョ殑闈㈢Н鏄寚姘存睜鐨勫簳闈㈢Н鍜屼晶闈㈢Н涔嬪拰锛岀敱姝ゅ厛鍒╃敤鍦嗘煴鐨勫簳闈㈢Н鍜屼晶闈㈢Н鍏紡璁$畻鍑洪渶瑕佹姽姘存偿鐨勬婚潰绉紝鍐嶄箻3鍗冲彲瑙g瓟锛庤В锛3.14脳锛4梅2锛²+3.14脳4脳3 =3.14脳4+37.68 =12.56+37.68 =50.24锛堝钩鏂圭背锛夛紝50.24脳3锛150.72锛堝崈鍏嬶級锛...
绛旓細鍦嗘煴褰㈣搫姘存睜鐨搴曢潰鍗婂緞=6梅2=3(绫)鎶规按娉ョ殑闈㈢Н =鍦嗘煴褰㈣搫姘存睜鐨勫簳闈㈢Н+鍦嗘煴褰㈣搫姘存睜鐨勪晶闈㈢Н =3.14脳3脳3+3.14脳6脳1.5 =28.26+28.26 =56.52(骞虫柟绫)
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