这道题怎么解？（六年级数学下学期）请高手帮忙
\u8fd9\u9053\u9898\u600e\u4e48\u89e3\uff1f\uff08\u516d\u5e74\u7ea7\u6570\u5b66\u4e0b\u5b66\u671f\uff09\u8bf7\u9ad8\u624b \u5e2e\u5fd9X-M\u22650
3-2X\uff1e-1
M\u2264X<2
\u6709\u4e09\u4e2a\u6574\u6570\u89e3-1\uff0c0\uff0c1
-2<M\u2264-1
\u888b\u4e2d\u7684\u5927\u7c73\u5403\u53bb\u4e863/4\uff0c\u5403\u53bb\u7684\u5927\u7c73\u662f25\u4e8e1/2\u5343\u514b\uff0c\u888b\u4e2d\u539f\u6709\u5927\u7c73\u591a\u5c11\u5343\u514b\uff1f
25\u53c81/2\u00f73/4=34(\u5343\u514b)
\u53c2\u52a0\u5408\u5531\u961f\u7684\u7537\u751f\u4eba\u6570\u6bd4\u5973\u751f\u4eba\u6570\u591a28\u4eba\uff0c\u5973\u751f\u5168\u90e8\u88ab\u8bc4\u4e3a\u4f18\u79c0\u5408\u5531\u961f\u961f\u5458\uff0c\u800c\u7537\u751f\u53ea\u67093/4\u88ab\u8bc4\u4e0a\u3002\u7537\u3001\u5973\u751f\u4f18\u79c0\u5408\u5531\u961f\u5458\u517142\u4eba\uff0c\u53c2\u52a0\u5408\u5531\u961f\u7684\u7537\u5973\u751f\u5404\u591a\u5c11\u4eba\uff1f(\u7528\u7b97\u672f\u6cd5\uff09
\u5973\uff1a(42-28*3/4)/(1+3/4)=12\u4eba \u7537\uff1a12+28=40\u4eba
\u7b54\uff1a\u5408\u5531\u961f\u7684\u7537\u751f\u670940\u4eba\uff0c\u5973\u751f\u670912\u4eba\u3002
-----------------------------------------------------------------
\u67d0\u6821\u516d\u5e74\u7ea7\u53c8\u6765\u6709370\u4eba\uff0c\u4eca\u5e74\u7537\u751f\u670910%\u8f6c\u6821\u79bb\u5f00\u4e86\uff0c\u5973\u751f\u67095%\u8f6c\u6821\u79bb\u5f00\u4e86\uff0c\u73b0\u5728\u8fd9\u4e2a\u5e74\u7ea7\u7537\u5973\u7684\u4eba\u6570\u4e00\u6837\u591a\uff0c\u73b0\u5728\u8fd9\u4e2a\u5e74\u7ea7\u6709\u5b66\u751f\u591a\u5c11\u4eba
\u5c06\u73b0\u5728\u4e00\u6837\u591a\u7684\u4eba\u6570\u770b\u505a\u5355\u4f4d\u4e00
\u539f\u6765\u7537\u751f10/9
\u539f\u6765\u5973\u751f20/19
370 \u76f8\u5f53\u4e8e10/9+20/19
370\u00f7\uff0810/9+20/19\uff09 \u00d72 \uff1d342\u4eba
\u6216
\u8bbe\u5148\u5728\u6709\u7684\u4eba\u6570\u4e3a2X\u5219\u73b0\u5728\u7537\u751f\u6709x\u4eba\u3001\u5973\u751f\u6709x\u4eba\uff0c\u90a3\u4e48\u539f\u6765\u7684\u7537\u751f\u5e94\u8be5\u670910x/9\u4eba\uff0c\u539f\u6765\u5973\u751f\u6709100x/95\u4eba\u3002 \u53c8\u670910x/9+100x/95=370,\u6240\u4ee5x=171\uff0c\u6240\u6709\u73b0\u5728\u8fd9\u4e2a\u5e74\u7ea7\u67092x=2*171=342\u4eba\uff01
---------------------------------------------------------------
1.\u4e00\u4e2a\u957f\u65b9\u5f62\u7684\u5468\u957f\u662f40\u7c73\uff0c\u957f\u548c\u5bbd\u5f97\u6bd4\u662f3\uff1a2.\u5982\u679c\u5728\u8fd9\u4e2a\u957f\u65b9\u5f62\u4e2d\u753b\u4e00\u4e2a\u6700\u5927\u7684\u5706\uff0c\u5706\u7684\u9762\u79ef\u662f\u591a\u5c11\uff1f
2.\u4e00\u6839\u94c1\u4e1d\u957f48\u5398\u7c73\uff0c\u628a\u5b83\u5f2f\u6210\u4e00\u4e2a\u957f\u65b9\u4f53\uff08\u6ca1\u6709\u5269\u4f59\uff09\uff0c\u957f\u3001\u5bbd\u3001\u9ad8\u7684\u6bd4\u662f3\uff1a4\uff1a5\uff0c\u8fd9\u4e2a\u957f\u65b9\u4f53\u7684\u4f53\u79ef\u662f\u591a\u5c11\uff1f
3.\u7528\u4e00\u683916\u5206\u7c73\u957f\u7684\u94c1\u4e1d\u505a\u4e00\u4e2a\u94c1\u5708\uff0c\u63a5
\u5934\u5904\u662f0.3\u5206\u7c73\uff0c\u8fd9\u4e2a\u94c1\u5708\u7684\u76f4\u5f84\u662f\u591a\u5c11
\u5206\u7c73\uff1f
1.1.\u4e00\u4e2a\u957f\u65b9\u5f62\u7684\u5468\u957f\u662f40\u7c73\uff0c\u957f\u548c\u5bbd\u5f97\u6bd4\u662f3\uff1a2.\u5982\u679c\u5728\u8fd9\u4e2a\u957f\u65b9\u5f62\u4e2d\u753b\u4e00\u4e2a\u6700\u5927\u7684\u5706\uff0c\u5706\u7684\u9762\u79ef\u662f\u591a\u5c11\uff1f
\u89e3\uff1a\u957f\u65b9\u5f62\u7684\u5468\u957f\u662f40\u7c73\uff0c\u5219\u957f\uff0b\u5bbd\uff1d40\u00f72\uff1d20\u7c73
\u53c8\u957f\u548c\u5bbd\u7684\u6bd4\u662f3\uff1a2.\u6545\uff1a\u5bbd\u4e3a\uff1a20\u00d72/(3+2)\uff1d8
\u5728\u8fd9\u4e2a\u957f\u65b9\u5f62\u4e2d\u753b\u4e00\u4e2a\u6700\u5927\u7684\u5706\uff0c\u5219\u5706\u7684\u76f4\u89d2d\uff1d\u957f\u65b9\u5f62\u7684\u5bbd\uff1d8\u7c73
2. 2.\u4e00\u6839\u94c1\u4e1d\u957f48\u5398\u7c73\uff0c\u628a\u5b83\u5f2f\u6210\u4e00\u4e2a\u957f\u65b9\u4f53\uff08\u6ca1\u6709\u5269\u4f59\uff09\uff0c\u957f\u3001\u5bbd\u3001\u9ad8\u7684\u6bd4\u662f3\uff1a4\uff1a5\uff0c\u8fd9\u4e2a\u957f\u65b9\u4f53\u7684\u4f53\u79ef\u662f\u591a\u5c11\uff1f
\u89e3\uff1a\u957f\u65b9\u4f53\u670912\u6761\u68f1\uff0c\u957f\u3001\u5bbd\u3001\u9ad8\u54044\u6761\uff0c\u6545\u957f\uff0b\u5bbd\uff0b\u9ad8\uff1d48\u00f74\uff1d12\u5398\u7c73
\u6545\uff1a\u957f\uff1a12\u00d73/(3+4+5)=3\u5398\u7c73
\u5bbd\uff1a12\u00d74/(3+4+5)=4\u5398\u7c73
\u9ad8\uff1a12\u00d75/(3+4+5)=5\u5398\u7c73
3.\u752816-0.3\u7684\u5dee\u9664\u4ee53.14(\u5706\u5468\u7387\uff09, \u5f975\u5398\u7c73.
\u5e2e\u4f60\u4e86\uff01
(3-M)X>-6
X>-6/(3-M)=6/(M-3)
比较符未变,则3-M>0 M<3
MX-2<3X+4
(3-M)X>-6
X>-6/(3-M)=6/(M-3)
3-M>0M<3
绛旓細锛1锛夈佽櫄绾夸笂鏂圭殑涓ゆ璺▼鏄竴鏍风殑锛岄偅涔堟墍鐢ㄧ殑鏃堕棿搴旇5:4锛屼笅鍧＄敤浜10:30-10:22=8锛堝垎閽燂級锛岄偅涔堜笂鍧″氨鐢ㄤ簡8梅4脳5=10锛堝垎閽燂級鈥斺斻5浠芥瘮4浠斤紝8闄や互瀹冨搴旂殑涓嬪潯鐨4浠斤紝姹傚嚭姣忎唤鐨勯噺锛屽啀涔樹互涓婂潯鐨5浠斤紝鍗宠繖娈典笂鍧＄殑鏃堕棿銆戯紝鎵浠ュ埌杈惧Д濮ュ鐨勬椂闂翠负8:30+10鍒嗛挓=8:40锛堝垎閽燂級銆傦紙...
绛旓細瑙ｏ細 3/14+X=11/14 X=11/14-3/14 X=8/14 X=4/7
绛旓細棣栧厛锛屾垜浠彲浠ュ皢5.2闄や互x绛変簬1.3杩欎釜闄ゆ硶闂杞寲涓鏁板鏂圭▼锛5.2梅x=1.3 瑕瑙ｈ繖涓鏂圭▼锛屾垜浠彲浠ュ皢5.2闄や互1.3锛屽緱鍒颁竴涓晢鍜屼竴涓綑鏁般傝繖涓晢灏辨槸x鐨勫硷紝鑰屼綑鏁板彲浠ョ敤鏉ラ獙璇佹垜浠殑绛旀鏄惁姝ｇ‘銆傝绠楃粨鏋滀负锛5.2梅1.3=4...0.2 鎵浠ワ紝x=4锛屼綑鏁颁负0.2銆傜幇鍦ㄦ垜浠彲浠ラ獙璇佹垜浠殑绛旀鏄惁...
绛旓細1銆佽В锛氳AB涓ゅ湴鐩歌窛x鍗冪背銆傚杞﹂熷害锛氾紙x-180锛壝凤紙5+3锛=锛坸-180锛/8 璐ц溅閫熷害锛氾紙x-210锛壝凤紙5+3锛=锛坸-210锛/8 銆愶紙x-180锛/8+锛坸-210锛/8銆懨5=x 锛 2x-390锛壝5/8=x 2x-390=8/5x 2/5x=390 x=975 绛旓細AB涓ゅ湴鐩歌窛975鍗冪背.2銆佽В锛氳鐮存崯鐨勭鏈墄涓傦紙400-x锛...
绛旓細涓鑸В鏂圭▼涔嬪悗锛岄渶瑕佽繘琛岄獙璇併楠岃瘉灏辨槸灏嗚В寰楃殑鏈煡鏁扮殑鍊间唬鍏ュ師鏂圭▼锛岀湅鐪嬫柟绋嬩袱杈规槸鍚︾浉绛夈傚鏋滅浉绛夛紝閭ｄ箞鎵姹傚緱鐨勫煎氨鏄柟绋嬬殑瑙銆傞獙绠楋細灏唜=22甯﹀叆绛夊紡宸﹁竟 3.4脳22-48=74.8-48=26.8 绛変簬绛夊紡鍙宠竟锛3.4X-48=26.8 瑙ｏ細X=22锛岀瓟妗堟槸姝ｇ‘ 姝ら涓轰竴鍏冧竴娆℃柟绋嬬殑鏍囧噯褰㈠紡锛屽嵆鎵鏈変竴鍏...
绛旓細瑙ｏ細璁惧師鏉ユ湁鐩愭按xkg锛40%x=锛坸+80锛壝30%...锛堝姞姘村墠鍚庣函鐩愪笉鍙橈級x=240锛涘張璁惧姞鐩恲kg锛岋紙240+80锛壝楋紙1-30%锛=锛240+80+y锛壝楋紙1-50%锛...锛堝姞鐩愬墠鍚庢按涓嶅彉锛320脳70=锛320+y锛壝50 瑙ｅ緱锛寉=128
绛旓細鍒欐湁 360x=30x+150 瑙ｅ緱 x=15/33 鍗 鏃堕拡闇杞 15/33*30=150/11 掳 楠岀畻锛氭鏃 鍒嗛拡杞繃 360*15/33=1800/11 涓よ呯浉宸 锛1800-150锛/11=150掳 涓轰袱鑰呭師鍏堢浉宸噺 2 鍥犱负鈭燗OB+鈭燘OC+鈭燙OD+鈭燚OA=360掳 鍛ㄨ 璁 鈭燘OC=2k 鍒欌垹COD=3k 鈭燚OA=4k锛屸垹AOB=2k-10 鍒欐湁 2k-10+...
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绛旓細绛旓細閬撹矾闀9/10KM锛屼竴鍏辨牻浜37妫垫爲锛屼袱绔兘鏍戒簡鏍 鍙緱锛屾墍鏍芥爲涔嬮棿鐨勯棿璺濆叡鏈37-1=36涓 鎵浠ワ紝闂磋窛涓猴細9/10/36=1/40KM 鍥剧墖涓殑杩囩▼閿欒涓鸿绠楅敊璇簡 9涓36绾︽帀锛屽墿涓嬬殑4搴旇涔樺埌鍒嗘瘝涓婏紝鑰屼笉鏄湪鍒嗗瓙涓婏紝鎵浠ユ濊矾鏄鐨勶紝浣嗘槸瑕佸皬蹇冭绠 甯屾湜鍥炵瓟瀵逛綘鏈夌敤銆
绛旓細1銆佽姳鍦冨崐寰 r=62.8/3.14/2 闈㈢Н灏辨槸锛3.14*锛坮+1锛塣2-3.14*r^2 = 3.14*(r+1+r)*(r+1-r) = 3.14*(2*r+1) = 3.14*(62.8/3.14+1) = 62.8+3.14 = 65.94 2銆佸悓1锛3.14*锛2*r+1)鏄潰绉 3.14*锛2*r+1)*32*4.5杩欐槸鎶曡祫棰 3銆侀暱 4.85 瀹 4.85...
