六年级下册数学难题 六年级下册数学难题
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（x+2x+3x)*4=48
解得x=3
所以长为9，宽6，高为3
所以体积为9X6X3＝162
设全长为x米，则第一天修了（1/5）x,第二天修了（1/5）x＋200
则（1/5）x＋（1/5）x＋200＋700＝x
解得x=1500
1. 设该长方体的长为3x dm，宽为2x dm，高为x dm。
则：3x+2x+x=48
x=8
长为3x=24 dm，宽为2x=16 dm，高为x=8 dm
V=24*16*8=3072 立方分米
2. 设第一天修了x米。
则：x+x+200+700=5x
x=300
公路全长为5x=1500米
1、48
2、这条公路全长1500米
1 48
2 1500
绛旓細1.涓涓渾閿ュ舰鐨勬矙鍫嗭紝搴曢潰绉槸28.26骞虫柟绫筹紝楂樻槸2m锛岀敤杩欏爢娌欏湪5m瀹界殑鍏矾涓婏紝閾2cm鍘氱殑璺潰锛岃兘閾哄灏戠背锛熻В锛氬渾閿ヤ綋绉=1/3*28.26*2=18.84绔嬫柟绫 L=18.84/(5*0.02)=188.4绫 绛旓細鑳介摵1.884绫 2.涓杈嗚揣杞﹁溅鍘㈡槸涓涓暱鏂逛綋锛岄暱鏄4m锛屽鏄2.5m锛岄珮鏄2m锛岃婊′竴杞︽矙瀛愶紝鍗镐笅鍚庯紝...
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绛旓細1.鐗涘悆鑽夐棶棰 璁炬瘡涓獥鍙ｏ紝姣忓垎閽熻兘鎺ュ緟鐨勯【瀹负1浠 1涓獥鍙ｏ紝15鍒嗛挓鑳芥帴寰咃細1脳15=15浠 2涓獥鍙ｏ紝30鍒嗛挓鑳芥帴寰咃細2脳30=60浠 鐩稿樊锛60-15=45浠 杩45浠斤紝灏辨槸鍦30-15=15鍒嗛挓鍐呮潵鍒扮殑椤惧 骞冲潎姣忓垎閽熸潵鐨勯【瀹负锛45梅15=3浠 涓轰簡淇濊瘉椤惧闅忓埌闅忓姙鐞嗭紝鑷冲皯闇瑕佸紑3涓獥鍙 2.浠ュ師鏉ュ浘涔﹀鐨...
