妹妹的数学题，通分比大小
\u6570\u5b66\u9898\uff08\u901a\u5206\uff096\u548c9\u301018 \u3011 3\u548c5\u3010 15\u3011 6\u548c36\u301036 \u3011
12\u548c18\u301036 \u3011 8\u548c9\u3010 72\u3011 20\u548c30\u301060 \u3011
15\u548c45\u301045 \u3011 22\u548c33\u301066 \u3011 7\u548c11\u301077 \u3011
\u5728\u6bcf\u7ec4\u5206\u6570\u540e\u9762\u7684\u3010 \u3011\u5185\u5199\u51fa\u4ed6\u4eec\u7684\u516c\u5206\u6bcd
3\u5206\u4e4b2\u548c4\u5206\u4e4b3\u301012 \u3011 6\u5206\u4e4b5\u548c7\u5206\u4e4b5\u301042 \u3011
39\u5206\u4e4b5\u548c26\u5206\u4e4b7\u301078 \u3011 7\u5206\u4e4b6\u548c11\u5206\u4e4b3\u301077 \u3011
12\u5206\u4e4b7\u548c6\u5206\u4e4b5\u301012 \u3011 20\u5206\u4e4b9\u548c10\u5206\u4e4b7\u301020 \u3011
\u628a\u4e0b\u9762\u4e24\u7ec4\u5206\u6570\u901a\u5206\uff08\u586b\u7a7a\uff09
\uff081\uff0915\u5206\u4e4b7=15x\uff082\uff097x\uff082\uff09=\uff0830\uff09\u5206\u4e4b\uff0814\uff09
10\u5206\u4e4b7=10x\uff083\uff097x\uff083\uff09=\uff0830\uff09\u5206\u4e4b\uff0821\uff09
\uff082\uff094\u5206\u4e4b9=4x\uff089\uff099x\uff089\uff09=\uff0836\uff09\u5206\u4e4b\uff0881\uff09
9\u5206\u4e4b4=9x\uff084\uff094x\uff084\uff09=\uff0836\uff09\u5206\u4e4b\uff0816\uff09
\u628a\u4e0b\u9762\u5404\u7ec4\u5206\u6570\u901a\u5206\uff08\u5217\u51fa\u5f0f\u5b50\uff09
1\uff1a9\u5206\u4e4b1\u548c4\u5206\u4e4b5 9\u5206\u4e4b1=4/(4*9)=4/36
4\u5206\u4e4b5=(5*9)/(4*9)=45/36
2\uff1a8\u5206\u4e4b7\u548c12\u5206\u4e4b7
8\u5206\u4e4b7=(7*3)/(8*3)=21/24 12\u5206\u4e4b7=(7*2)/(12*2)=14/24
3\uff1a7\u5206\u4e4b6\u548c33\u5206\u4e4b7
7\u5206\u4e4b6=(6*33)/(7*33)=198/231 33\u5206\u4e4b7=(7*7)/(33*7)=49/231
4\uff1a20\u5206\u4e4b3\u548c66\u548c17
20\u5206\u4e4b3=(3*33)/(20*33)=99/660
66\u5206\u4e4b17 =(17*10)/(66*10)=170/660
\u4e24\u4e2a\u6700\u7b80\u771f\u5206\u6570\uff0c\u901a\u8fc7\u5206\u540e\u7684\u5206\u6bcd\u662f12\uff0c\u8fd9\u4e24\u4e2a\u771f\u5206\u6570\u662f\u591a\u5c11\uff1f
\u7b54\uff1a 1/4\u548c1/3
6\u5206\u4e4b7\u7684\u5206\u6bcd\u52a0\u4e0a12\uff0c\u8981\u662f\u5206\u6570\u5927\u5c0f\u4e0d\u53d8\uff0c\u5b83\u7684\u5206\u5b50\u5e94\u52a0\u4e0a\u591a\u5c11\uff1f
\u7b54\uff1a \u5b83\u7684\u5206\u5b50\u5e94\u8be5\u52a0\u4e0a14 \u56e0\u4e3a12/6=2 7*2=14 \u6240\u4ee5\u5b83\u7684\u5206\u5b50\u5e94\u8be5\u52a0\u4e0a14
\u4e0d\u901a\u5206\uff0c\u90a3\u4e48\u4f60\u53ea\u80fd\u6c42\u51fa\u76f8\u5e94\u7684\u5c0f\u6570\u4e86\uff0c\u7136\u540e\u6bd4\u8f83
4/9=0.44
6/13=0.462
\u6240\u4ee54/9<6/13
\u4f46\u662f\u6700\u597d\u8fd8\u662f\u901a\u5206(\u2299o\u2299)\u54e6
5/12=（5×3）/（12×3）=15/36
因为：16/36＞15/36
所以，4/9＞5/12
3/16=（3×3）/（16×3）=9/48
7/24=（7×2）/（24×2）=14/48
因为：9/48＜14/48
所以，3/16＜7/24
1/3=（1×33）/（3×33）=33/99
4/9=（4×11）/（9×11）=44/99
8/11=（8×9）/（11×9）=72/99
因为：33/99＜44/99＜72/99
所以，1/3＜4/9＜8/11
解：
4/9和5/12
4/9=16/36
5/12=15/36
由于16>15
所以：16/36>15/36
即：4/9>5/12
3/16和7/24
3/16=9/48
7/24=14/48
由于14>9
所以：14/48>9/48
即：7/24>3/16
1/3，4/9，8/11
1/3=99/297
4/9=132/297
8/11=216/297
由于216>132>99
所以：216/297>132/297>99/297
即：8/11>4/9>1/3
绛旓細4/9=锛4脳4锛/锛9脳4锛=16/36 5/12=锛5脳3锛/锛12脳3锛=15/36 鍥犱负锛16/36锛15/36 鎵浠ワ紝4/9锛5/12 3/16=锛3脳3锛/锛16脳3锛=9/48 7/24=锛7脳2锛/锛24脳2锛=14/48 鍥犱负锛9/48锛14/48 鎵浠ワ紝3/16锛7/24 1/3=锛1脳33锛/锛3脳33锛=33/99 4/9=锛4脳11锛/...
绛旓細濡瑰姣斿濮愬鍚1/30
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绛旓細3/4X+2/3X=42 (3/4+2/3)X=42 17/12*x=42 x=42*12/17
绛旓細濮愬=15脳2梅锛1/4+1/8锛=80鍙 濡瑰=120-80=40鍙 绁濅綘瀛︿範杩涙锛佷笉鐞嗚В璇疯拷闂紝鐞嗚В璇峰強鏃堕噰绾筹紒(*^__^*)
绛旓細瑙ｏ細鏍规嵁棰樻剰寰2M-锛5M-1锛/3+锛7-M锛/2=5 瑙ｆ柟绋嬶紝寰2M-銆愶紙5M-1锛/3-锛7-M锛/2銆=5 2M-銆10M-2-锛21-3M锛/6銆 =5 2M-锛13M-23锛/6 =5 -M/6 =7/6 M =-7 鍗冲綋M=-7鏃讹紝鏁村紡2M-锛5M-1锛/3鐨勫间笌锛7-M锛/2鐨勫肩殑鍜岀瓑浜5銆傛垜杩欎釜缁濆姝ｇ‘锛屽洜涓...
绛旓細1銆佽В锛氭牴鎹鎰忕煡锛50/a=(50-3)/b 鍗筹細50/a=47/b b=47a/50 鑻ュ濮愬悗閫3m,鍒欏埌杈剧粓鐐逛袱浜虹敤鐨勬椂闂村垎鍒负:53/a 锛50/b=50/(47a/50)=2500/(47a)閫氳繃姣旇緝鐭53/a <2500/(47a) ,鎵浠ヤ袱浜轰笉鑳藉悓鏃跺埌杈剧粓鐐癸紝濮愬鍏堝埌 2銆佽嫢鎯充袱浜哄悓鏃跺埌杈剧粓鐐癸紝鍒欒濮愬浠庤捣鐐瑰悗閫X绫筹紝鏍规嵁...
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绛旓細瑕佽繃绋嬪悧
