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一、填空题(2′×16=32′)1.9的平方根是,2+8=,a34÷a=.2.当x时,x+1x-2在实数范围内有意义.3.若ab=13,则a+bb=.4.已知线段a=4cm,b=9cm,则线段a,b的比例中项c为cm.5.已知1、2,2三个数,请你再添上一个数,写出一个比例式:.6.写出一个大于-1,小于0的无理数为.7.已知x12,化简3x+2-1
1. The square root of the fill-in (2′×16=32′) 1.9 is 2+8=, a34÷a=.2. When x, x+1x-2 is significant in the real range. 3. If ab =13, then a+bb=.4. Known line segment a=4cm, b=9cm, then the proportion of line segment a, b in the item c is cm.5. Known 1,2,2 three numbers, please Add another number and write a ratio: 6. Write an irrational number greater than -1 and less than 0. 7. Known x12, Simplify 3x+2-1