在10,9,8,7,6,5,4,3,2,1这十个数的每相邻两数之间

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9无论加还是减8都为奇数加或减7为偶数偶数加减偶数6为偶数偶数加减奇数5为奇数奇数加减偶数4为奇数奇数加减奇数3为偶数偶数加减偶数2为偶数偶数加减奇数1为奇数因为20不是奇数所以无解

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再答：再问：6分之7除以9分之5在乘以14分之5再问：5分之2减去5分之2在除以2在乘以3分之5再答：

{(10-9)(8-7)(6-5)(4-3)}×2×1＝8

{[(10-9)*8-7]*6-5}*4-3+2+1=410-9-8+7+(6-5+4-3)*2*1=410*9-8*7-6*5+4-3-2+1=4

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1+2+3+4+5-6+7+8+9-10-11-121+2+3-4-5-6-7-8-9+10+11+12

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不可能!1+2+3+...+9=45每把一个加变成减,都会从45上减掉一个偶数,其值必为奇数!而10为偶数~∴不可能

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12中间一列的数等于第三列的数减去第一列的数,然后再乘2如8=（6－2）×2=4；10=（10－5）×2=10；所以()=（12-6）×2=12

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规律：1在第一圈,2~4在第二圈,5~9在第三圈,10~16在第四圈.(n-1)^2+1~n^2在第n圈如果n为奇数,则顺序为(n-1)^2+1在第1行第n列,然后(n-1)^2+2在第2行第n列..

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10/6=1.67元7/4=1.75元8/5=1.6元所以乙商店单价最高再问：10/6是约等于1.67吧？

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