将一个数有目的的“拆”成几个数之和(或积),往往能使一些貌似繁难的题目迎刃而解.请看例题.例1已知“、为、’、d是互不相等的整数,且ab’d一1994.求a十b+’十d的最大值. 解把1994分解-”拆“-成四个整数之积,得 1994=(一l)只l又(一2)只997. 易见,a十b+’十d的最大值一(一1) The ”disassembly“ of a number of purposeful numbers into the sum (or product) of several numbers often makes it possible to solve some seemingly difficult problems. See the examples. Example 1 Known ”, yes, “, d are not equal to each other Integer, and ab’d a 1994. Find a 10 b + ’10 d maximum. Solution to the 1994 decomposition - ”demolition " - the product of four integers, in 1994 = (a l) only l and ( A 2) only 997. Easy to see, a ten b + ’a maximum of ten d (one 1)