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2011年8月29日 · 应把5个数做为一组。 其中每组数的前三个自成一类。 如 （ [2 3 4] 15 12） （ [3 4 5] 28 20 ) ( [4 5 6] 45 30) ....... (以此类推) 所以，问号应该为 7* (8+5)=91。 （冒昧的问一句：倒数第5个数应该是6吧~ 是你抄错了还是本来就是5呢？ 呵呵~） 现在就很清楚了，？ =66+25=91. 这25个数为5组，2,3,4,15,12/3,4,5,28,20/4,5,6,45,30/5,6,7,66,42/5,7,8,?,56每组倒数第二个数为 (第一个数+第二个数)乘第二个数：如第一组15= (2+3)*3，最后一个数为第二个乘第三个 …

第一步：判断题型-----本题为组合数列 第二步：题目详解 将原数列进行两两分组：[5，24][6，20][4，（）][40，3]； 观察发现，每组内的乘积均为120，故所求项为120÷4=30。

1、第一组：5×24=120；第二组：6×20=120；第四组：40×3=120； 2、观察规律如下：两两分组，每组两项的乘积都是120； 3、所以，第三组：120÷4=30，第三组应该为：4、30；

适马 dc ex 10-20/4-5.6 hsm 综述 此镜头的整体设计概念，是专诚针对目前市场上普及数码单镜相机，所采用的影像传感器 APS-C 格式和特性而设计；同时引用崭新光学技术编排，修正数码影像上常见出现的〝横向色差〞，即三原色影像不同大小的光差现像。

2023年10月19日 · Solve math problems using order of operations like PEMDAS, BEDMAS, BODMAS, GEMDAS and MDAS. (PEMDAS Caution) This calculator solves math equations that add, subtract, multiply and divide positive and negative numbers and exponential numbers. You can also include parentheses and numbers with exponents or roots in your equations.

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