The product of two facing pages of a book is 992.Find the tw

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The product of two facing pages of a book is 992.Find the two pages numbers.
亲们,麻烦看到了就回答下吧,

两个相邻页面页数的乘积是992.找出这两个页数来.
设页数1为x,则页数2必然为x+1.
x (x + 1) = 992
因为x必须是正整数,解得x = 31
所以是第31和第32页.

为什么是31?
根号992 = 31.5,介于31和32之间,所以就是这两个数了.

如果不知道具体数值,首先992开根号应该比根号900大一点,根号900是30.
其次,相邻两个数相乘最后一位得2,只有1和2,3和4,6和7,8和9. 试试哪个对.

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