～、填空题(每小题3分,共33分) 1.一{的绝对值是——;一1.5的相反数是——一;篙的算术平方根是——- 2.计算:({一丢)×10=——; 一4力÷压:——; (一25z。y)÷(一5z。了)=——一. 3.正八边形的每个中心角为——度;邻补角的平分线所组成的角为——度;等腰三角形两边长分别为6和1 To fill in the blanks (3 points for each question, total 33 points) 1. The absolute value of { is ——; the opposite of 1.5 is – 1; the arithmetic square root of 篙 is ——- 2. Calculation: ({ A lost) × 10 = -; A 4 force pressure: -; (a 25z. y) ÷ (a 5z. ) = - a. 3. Each central angle of the positive octagon is - degrees The angle formed by the bisector of the adjacent supplementary angle is - degree; the lengths of the isosceles triangle are respectively 6 and 1 on both sides;