15-1 out of 8 is equal to?

seven-eighths

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4. If there are only four positive integer solutions to the inequality 2x-a ≤ 0, the value range of a is obtained
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8. What does a ≡ B ≡ C mean?
9. (a=b || a=c || b=c)
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11. -4.5 + (- 17 / 3) equals
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13. It is known that the perimeter of a rectangle is 45cm and the length of one side is ACM, then the area of the rectangle is as follows:
14. Several usages of Dash: select the function of Dash: a) explain b) voice lengthen C) topic change d) further explain Annie is a girl full of vitality, extraordinary patience and rich imagination --- a natural teacher 2. This is a special typeface specially printed for the blind - "reading" through the feeling of hand 3. Thank Annie for giving me the ability to speak this precious gift Note: for the text, please refer to Lesson 18, Volume 11, Xiaoyu, Western normal school edition, always remember you, teacher
15. Simplification: asin0 ° + bcos90 ° + ctan180 °; - P (square) cos180 ° + Q (square) sin90 ° - 2pqcos0 ° We also know that Tana = - 3 / 4, find Sina, cosa. We know that cosa = 0.68, find Sina, Tana (retain 2 significant digits). Simplify a (square) Cos2 π - B (square) SIN3 π / 2 + abcos π - absin π / 2
16. The circumference of a circle is 4 π cm, and its area is______ Square centimeter
17. The radius of a sector is 30cm, the center angle is 120 ° and it is used as the side of a cone______ ．
18. Make a rectangle with two squares of 1 cm in length. What's the perimeter of the rectangle?
19. As shown in the figure, in RT △ ABC, ∠ C = RT ∠, three semicircles are made by taking the three sides of the right triangle as the diameter, then the relationship among S1, S2 and S3 is as follows:______ ．
20. Find the equation that passes through the intersection of the straight line / 1:2x + 3y-5 = 0, / 2:3x-2y-3 = 0, with an inclination angle of 45 degrees!