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F.2 Maths Questions1
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請列式, thanks3. A shirt: $126A pair of jeans: $295Discount for a pair of jeans: 10%Extra discount for total amount more than $350: 10%Esiimate how much the bill is.5.(a) Decide in which case the estimate should be round up or round down, and to estimate the anwser.(b)Explain the reasons for... 顯示更多 請列式, thanks 3. A shirt: $126 A pair of jeans: $295 Discount for a pair of jeans: 10% Extra discount for total amount more than $350: 10% Esiimate how much the bill is. 5. (a) Decide in which case the estimate should be round up or round down, and to estimate the anwser. (b)Explain the reasons for rounding-up or rounding down. 4. http://s17.photobucket.com/albums/b65/myy05/math1.jpg (a) By joining the line segments BD and ME, find the sum of all the interior angles of the petagon. (b) Hence, find the size of each angle 1. http://s17.photobucket.com/albums/b65/myy05/maths.jpg ABC is a right-angled triangle. Find the value of x. 8. http://s17.photobucket.com/albums/b65/myy05/mathss.jpg The figure shows a prism whose base is a parellelogram. If the total surface ares is 3284 cm2, find its volume. 9. http://s17.photobucket.com/albums/b65/myy05/mathssss.jpg Find the total surface area and volume of the cuboid formed by folding up the following net. 10. Polynomial : 5x^2-7x+x^3-9 Coefficient of (i)x^4 (ii)x (iii)constant term 11. http://s17.photobucket.com/albums/b65/myy05/mathsssss.jpg Refer to the figure. Find the value of x+y.
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嘩... 咁多o既, 盡人事啦 1. Using sine formula, cos BAC = (6^2 + 10^2 - 8^2)/ (2x6x10) cos BAC = 0.6 angle BAC = 53.13 (corr to 2 decimal places) sin BAC = x/6 sin 53.13 = x/6 x = 6 sin 53.13 = 4.80 cm (corr to 2 decimal places) 3. Total amount before extra discount: $295 x (1-10%) + $126 = $391.5 The bill is: $391.5 x (1-10%) = $352.35 4(a). sum of all the interior angles of the petagon = angle ABE + angle EBD + angle DBC + angle BCD + angle CDB + angle EDB + angle BED + angle AEB + angle EAB Because angle ABE + angle AEB + angle EAB = 180 angle EBD + angle EDB + angle BED = 180 angle DBC + angle BCD + angle CDB = 180 (angles sum of triangle) So, angle ABE + angle EBD + angle DBC + angle BCD + angle CDB + angle EDB + angle BED + angle AEB + angle EAB = (angle ABE + angle AEB + angle EAB) + (angle EBD + angle EDB + angle BED) + (angle DBC + angle BCD + angle CDB) = 180 + 180 + 180 = 540 4(b) Since this is a petagon, therefore the size of every interior angle are the same, each angle is, 540/5 = 108 (5) 文字體唔幫你做。 (8) Total surface area = 16 x 12 x 2 + h x 16 x 2 + h x 13 x 2 3284 = 384 + 32h + 26 h 3284 = 384 + 58h 58h = 2900 h = 50 Volume = 16 x 12 x h because h = 50 (as above) Volume = 16 x 12 x 50 = 9600 cm3 (9) as it is a cuboid, the lenght of the base is (11- 3)/2 = 4 Total surface area = 4 x 5 x 2 + 3 x 5 x 2 + 4 x 3 x 2 = 94 cm2 Volume = 4 x 5 x 3 = 60cm3 (11) x = -12, y = -8 (refer to figure) x + y = (-12) + (-8) = (-12) -8 = -20 (10) 你係咪copy 錯題目呀? 無理由出到x o既4 次方bor
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