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一、填空 1.一个凸多边形恰好有3个内角是钝角,这样的多边形边数的最大值是__。 2.现有一张长5cm,宽1cm的矩形纸,请你将它分成五块,再拼合成一个正方形(通过画图来表示)。矩形纸的分割法请在下图示意出来,正方形的拼合图,请画在横线上。 3.将四个数21/222,31/333,41/444,51/555从小到大排列(用等号或不等号连结)时,得 4.已知:a>0,x>0,x=1/2(a1/n-a-1/n)则(x+(1+x~2)~2=__。 5.已知(3a+2)~(1/(a~2+a))和(2n-1)~(15-a)是最简根
First, fill in the blank 1. A convex polygon happens to have three internal angles that are obtuse angles. The maximum value of such polygon edges is __. 2. There is a rectangular paper with a length of 5cm and a width of 1cm. Please divide it into five pieces and then spell it into a square (represented by drawing). The method of dividing the rectangular paper is shown in the figure below. Please use a square mosaic to draw on the horizontal line. 3. When the four numbers 21/222, 31/333, 41/444, 51/555 are arranged in ascending order (linked with an equal sign or inequality sign), they are 4. Known: a>0, x>0, x =1/2(a1/na-1/n) then (x+(1+x~2)~2=__. 5. Known (3a+2)~(1/(a~2+a)) and (2n-1)~(15-a) is the most basic