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展开全部按照管的规格看是一个长方体，既然是通风管，就意味着这个长方体的两个底面是不需要封闭的，所以计算其表面积只需计算4个面就可以了，即一节通风管的铁皮面积是120*10*4=4800，12节就需要12*4800=57600.',getTip:function(t,e){return t.renderTip(e.getAttribute(t.triangularSign),e.getAttribute("jubao"))},getILeft:function(t,e){return t.left+e.offsetWidth/2-e.tip.offsetWidth/2},getSHtml:function(t,e,n){return t.tpl.replace(/\{\{#href\}\}/g,e).replace(/\{\{#jubao\}\}/g,n)}},baobiao:{triangularSign:"data-baobiao",tpl:'{{#baobiao_text}}',getTip:function(t,e){return t.renderTip(e.getAttribute(t.triangularSign))},getILeft:function(t,e){return t.left-21},getSHtml:function(t,e,n){return t.tpl.replace(/\{\{#baobiao_text\}\}/g,e)}}};function l(t){return this.type=t.type
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展开全部（120+10）×10×2=2600（平方厘米）答：至少需要铁皮2600平方厘米。已赞过已踩过你对这个回答的评价是？评论
收起',getTip:function(t,e){return t.renderTip(e.getAttribute(t.triangularSign),e.getAttribute("jubao"))},getILeft:function(t,e){return t.left+e.offsetWidth/2-e.tip.offsetWidth/2},getSHtml:function(t,e,n){return t.tpl.replace(/\{\{#href\}\}/g,e).replace(/\{\{#jubao\}\}/g,n)}},baobiao:{triangularSign:"data-baobiao",tpl:'{{#baobiao_text}}',getTip:function(t,e){return t.renderTip(e.getAttribute(t.triangularSign))},getILeft:function(t,e){return t.left-21},getSHtml:function(t,e,n){return t.tpl.replace(/\{\{#baobiao_text\}\}/g,e)}}};function l(t){return this.type=t.type
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r.clientHeight}}return this._expandRectByRootMargin(e)},n.prototype._expandRectByRootMargin=function(t){var e=this._rootMarginValues.map((function(e,n){return"px"==e.unit?e.value:e.value*(n%2?t.width:t.height)/100})),n={top:t.top-e[0],right:t.right+e[1],bottom:t.bottom+e[2],left:t.left-e[3]};return n.width=n.right-n.left,n.height=n.bottom-n.top,n},n.prototype._hasCrossedThreshold=function(t,e){var n=t&&t.isIntersecting?t.intersectionRatio
0:-1,r=e.isIntersecting?e.intersectionRatio
0:-1;if(n!==r)for(var i=0;i0&&function(t,e,n,r){var i=document.getElementsByClassName(t);if(i.length>0)for(var o=0;o展开全部求表面积 。换言之 底面积是没有的。也就有3中情况，是长和宽那个表面没口，还是宽和高没口 还是，长和高的。。因为求的是最少。（那个我没算，lz自己算哈，）。 1.长和宽不是没口的那两个面。 2*宽*高+2*长*高2。宽和高
2*长*宽+2*长*高3. 长和高的
2*长*宽+2*宽*高以上讲的是 是通风管没口的解体方案了。如果求的是完整的通风管（也就是不缺口的，具体缺一个还是两个， 缺一个就 1来说 再+上长*宽就行了，如果两个口都在 就是+上 2*长*宽就行了 2，3同上） 写了怎么多 才发现没分啊至于楼上那个答案是求的体积，1楼的没看懂
本回答被网友采纳展开全部底面周长乘高 （120 10）*2*10=2600平方厘米 因为是通风管 所以是空心的
展开全部解：a=120cmb=10cmh=10cmS=2x(120x10+10x10)=2x(1200+100)=2x1300=2600平方厘米答：........展开全部120*10*4=4800
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