学校要粉刷教室的四壁与天花板。已知教室长13米，宽九米，高二点八米，门窗面积8平方米，如果粉刷一平 学校要粉刷一间教室的四壁和天花板．已知教室的长是10米，宽8...

\u674e\u8001\u5e08\u6253\u7b97\u7c89\u5237\u56db\u58c1\u548c\u5929\u82b1\u677f\uff0c\u957f5\uff0c\u5bbd4\u9ad83\uff0c\u95e8\u7a97\u536018\u5e73\u65b9\u7c73\u3002\u7c89\u5237\u9762\u79ef\u662f\u591a\u5c11\u5e73\u65b9\u7c73\uff1f

8\u00d76+\uff088\u00d74+6\u00d74\uff09\u00d72-18\uff1b =48+112-18\uff1b =160-18\uff1b =142\uff08\u5e73\u65b9\u7c73\uff09\uff1b 142\u00d7200=28400\uff08\u514b\uff09\uff1b\u7b54\uff1a\u7c89\u5237\u9762\u79ef\u662f142\u5e73\u65b9\u7c73\uff0c\u4e00\u5171\u7528\u77f3\u707028400\u514b\uff0e

10\u00d78+10\u00d73\u00d72+8\u00d73\u00d72-12.5\uff0c=80+60+48-12.5\uff0c=188-12.5\uff0c=175.5\uff08\u5e73\u65b9\u7c73\uff09\uff1b\u7b54\uff1a\u8981\u7c89\u5237\u7684\u9762\u79ef\u662f175.5\u5e73\u65b9\u7c73\uff0e

13x9+(13x2.8+9x2.8)x2-8=117+123.2-8=232.2
232.2x8=1857.6元

((13+9)*2*2.8-8)*8=912.6

1056元

1857.6

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绛旓細锛7+9锛*3*2+7*9-12.5=146.5

瀛︽牎瑕佺矇鍒涓闂存暀瀹,鍥涘鍜屽ぉ鑺辨澘銆傚凡鐭鏁欏鐨,闀挎槸涔濈背瀹芥槸涓冪背,楂...
绛旓細鍥涘鍜屽ぉ鑺辨澘鍏憋細锛7脳3+9脳3锛壝2+9脳7=159锛堝钩鏂圭背锛夋墸闄ら棬绐楄繕鍓╋細159-12.5=146.5锛堝钩鏂圭背锛闇瑕锛146.5脳4=586锛堝厓锛

瀛︽牎瑕佺矇鍒锋暀瀹ょ殑灞嬮《鍜屽洓闈㈠澹,鏁欏闀20绫,瀹15绫,楂4绫,鎵ｉ櫎闂ㄧ獥闈 ...
绛旓細20脳15+20脳4脳2+15脳4脳2-20=300+160+120-20=560锛堝钩鏂圭背锛560脳8=4480锛堝厓锛夛紟绛旓細绮夊埛鐨闈㈢Н鏄560骞虫柟绫筹紝浜哄伐闇瑕4480鍏冿紟

瀛︽牎瑕佺矇鍒涓闂鏁欏鐨勫洓澹佸拰澶╄姳.宸茬煡鏁欏鐨勯暱鏄9绫,瀹6绫,楂樻槸3绫...
绛旓細[9脳6+锛9脳3+6脳3锛壝2-15]脳6锛=[54+锛27+18锛壝2-15]脳6锛=[54+45脳2-15]脳6锛=[54+90-15]脳6锛=129脳6锛=774锛堝厓锛夛紟绛旓細绮夊埛杩欎釜鏁欏闇瑕鑺辫垂774鍏冿紟

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绛旓細130

瀛︽牎绮夊埛鏁欏鐨勫洓澹佸拰澶╄姳鏉,宸茬煡鏁欏闀7m,瀹5m,楂3m,鎵ｉ櫎闂ㄧ獥闈㈢Н12骞 ...
绛旓細锛7脳3锛+锛5脳3锛壝2+5脳7 =21+30+35 =86锛坢²锛夛紙86-12锛壝6.5 =74脳6.5 =481锛堝厓锛夌瓟锛绮夊埛杩欎釜鏁欏瑕佽姳481鍏冦

瀛︽牎瑕佺矇鍒涓闂鏁欏鐨勫洓澹佸拰灞嬮《,闄ゅ幓闂ㄧ獥鍜岄粦鏉跨殑闈㈢Н24骞虫柟绫,宸辩煡...
绛旓細8脳6+8脳4脳2+6脳4脳2=48+64+48=160锛堝钩鏂圭背锛160-24=136锛堝钩鏂圭背锛夌瓟锛绮夊埛鐨闈㈢Н鏄136骞虫柟绫筹紟

绮夊埛鏁欏闇瑕鑺辫垂澶氬皯鍏?
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瀛︽牎瑕佺矇鍒涓闂鏁欏鐨勫洓澹佸拰澶╄姳銆傚凡鐭ユ暀瀹ょ殑闀挎槸9绫,瀹7绫,楂樻槸3绫...
绛旓細9*3*2+7*3*2+9*7-12.5

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绛旓細9脳7+9脳3脳2+7脳3脳2-12.5=146.5骞虫柟绫