一个水池长1.5米,宽1米,深0.5米,要在水池外表面抹一层水泥。如果平均每平方米用水泥12千克, 某村要修建一个长80米,宽60米,深1.5米的蓄水池,如果要...
\u67d0\u6751\u8981\u4fee\u4e00\u4e2a\u957f80\u7c73\u3001\u5bbd60\u7c73\u3001\u6df11.5\u7c73\u7684\u84c4\u6c34\u6c60\uff0c\u5982\u679c\u8981\u5728\u6c34\u6c60\u7684\u56db\u5468\u548c\u5e95\u9762\u62b9\u4e00\u5c42\u6c34\u6ce5\uff0880\u00d7+60+60\u00d71.5+1.5\u00d780\uff09\u00d72-80\u00d760\uff0c=\uff084800+90+120\uff09\u00d72-4800\uff0c=5010\u00d72-4800\uff0c=10020-4800\uff0c=5220\uff08\u5e73\u65b9\u7c73\uff09\uff1b\u7b54\uff1a\u62b9\u6c34\u6ce5\u7684\u9762\u79ef\u662f5220\u5e73\u65b9\u7c73\uff0e
\uff081\uff09\uff0880+60\uff09\u00d72\u00d71.5+80\u00d760\uff0c=280\u00d71.5+4800\uff0c=420+4800\uff0c=5220\uff08\u5e73\u65b9\u7c73\uff09\uff1b\u7b54\uff1a\u62b9\u6c34\u6ce5\u7684\u9762\u79ef\u662f5220\u5e73\u65b9\u7c73\uff0e\uff082\uff09\u6c34\u6c60\u5185\u6709\u6c34\u7684\u7acb\u65b9\u662f\uff1a80\u00d760\u00d71.2\uff0c=4800\u00d71.2\uff0c=5760\uff08\u7acb\u65b9\u7c73\uff09\uff1b\u7b54\uff1a\u6c34\u6c60\u5185\u67095760\u7acb\u65b9\u7c73\u7684\u6c34\uff0e
解:水池的外表面积相当于除去顶面面积的长方体的表面积,这里是:
1.5×1+2×(1.5+1)×0.5 = 1.5+2.5 = 4(平方米)
一共需要用水泥 4×12 = 48(千克)
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摸水泥的有5个面(底面和周围4个面),那么摸水泥面积=1.5×0.5×2+1×0.5×2+1.5×1=4平方米
一共用水泥=12×4=48千克
1.5*0.5*2+1.5*1+1*0.5*2=4(平方米)
12*4=48(千克)
4666666666666666666666发货
绛旓細姘存睜鐨勫琛ㄩ潰绉浉褰撲簬闄ゅ幓椤堕潰闈㈢Н鐨勯暱鏂逛綋鐨勮〃闈㈢Н锛岃繖閲屾槸锛1.5脳1+2脳(1.5+1)脳0.5 = 1.5+2.5 = 4锛堝钩鏂圭背锛変竴鍏遍渶瑕佺敤姘存偿 4脳12 = 48锛堝崈鍏嬶級~ 婊℃剰璇烽噰绾筹紝涓嶆竻妤氳杩介棶銆--- ~ 姊崇悊鐭ヨ瘑锛屽府鍔╁埆浜猴紝鎰夋偊鑷繁銆倊 鈥滄暟鐞嗘棤闄愨濆洟闃熸杩庝綘 ~ http://zhidao.baidu.com/te...
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绛旓細=12脳銆1.5+2.5銆=12脳4 =48鍗冨厠
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绛旓細3+1.5*2+2*2=10