... 5y km to the north until 1 p.m. Therefore, at 1 p.m. her position is (5x - 5y) km relative to her home. (b) From 9 a.m. to 1...
ai. 4/6 * 3/5 * 2/4 * 1/3 = 1/15 First, you guess one colour from 6 choices. There are 4 correct answer so P(correct) = 4/6. Now there are 5 pigs left and you still need to guess 3 colours. P(correct) = 3/5. 如此類推... aii. This...
更新： 259350 呢個數係代表 由原本 20 個男同 15 個女入面簡 2 個男 同 4 個女出黎 [ 即 C(20,2) × C(15,4) = 259350 ] 但呢個 259350 係仲未考慮呢 6 個人嘅坐法 如果要考慮埋呢 6 個人嘅坐法 ( 所有可能性...
Note: For t being any real number, (vector) = ( position vector of a point) + t(direction vector) which is similar to y = c + mx ...
... 1 : Arrange 1 person from C and D to take the 1st position (2P1),1 person from of A, B, E and F to take the...
... is an diameter, a point in the circle, mark it as point E (except position of A &B) will make a right angle with A & B, you...
1)http://postimg.org/image/6coom6fwp/ 2)http://postimg.org/image/4ew09pbor/full/
將離地剛好17米的2點命名為 A和 B 將摩天輪的圓心命名為C 圓心離地的高為 ( 7.5 +4) = 11.5 將AB 的midpoint 命名為D 將ACD連成為一個直角三角形 將角ACD名為a AC = 15/2 = 7.5 (圓的半徑) DC= 17 -11.5 = 5.5 因此 cos a = 5.5 /7.5 a...
