Basically both of your statements are correct. The fundamental definition of nCr is the number of ways you can select r out of n objects random without considering the order of placement, which is equivalent to...
binomial 條式係 ( a + b)^n = sum of { C(n,r)a^(n-r)b^r } 你可以將左面睇成n個 (a+b) 自乘 , (a+b ) x ( a+b) x .... x (a+b) 1 2 n 依家有n 個括號 , 如果要乘開佢 , 即係由每個 (a+b) 中 抽1個element 出黎乘 例如 , 我可以係括號1 抽 a , 括號2 抽b , .... or 括號1 抽 b...
u^4 + u^2 x v^2 + v^4 = u^4 + 2(u^2) (v^2) + v^4 - (u^2)(v^2) = (u^2 + v^2)^2 - (uv)^2 = (u^2 + v^2 + uv)(u^2 + v^2 - uv) 2009-11-09 17:09:46 補充： u^4 + u^2 x v^2 + v^4 = u^4 + (u^2) (v^2) + v^4 + (u^2)(v^2) - (u^2)(v^2) = u^4 + (u^2)(v^2) + (u^2)(v^2) + v^4 - (u^2)(v^2) = u^4 + 2(u^2) (v^2) + v^4 - (u^2)(v^2) that means + (u^2)(v^2...
1.sorry,想不到 2. (10-8) x 9+6 = 24 3. (9-7) x 7+10= 24 4.(10-7) x 5 +9=24 5. (7-4) x 8 +12=24 6.(13-6) x (8-4) =24
1. 25(3x - 2y)² – 9(2x + y)² =25(9x²-12xy+4y²)-9(4x²+4xy+y²) =225x²-300xy+100y²-36x²-36xy-9y² =189x²-336xy+91y² =(9x-13y)(21x-7y) 2. (a² + b²)² – 4a²b² =(a² + b²)²–(2ab)².........4a²b²=2²a²b²=(2ab)² =(a² + b²-2ab...
Five over bracket three x minus two or Five divided by bracket three x minus two
Let $x be the amount that Mary has. x / 2 - 39 = 120 x / 2 = 120 + 39 x / 2 = 159 x = 159 * 2 x = 318
1. (n*n*...*n)/(n+n+...+n) = [n/(n+n...+n)]^n = (1/n)^n = 1/(n^n) 2. (x^2 - √(3x) + 1)(x^2 + √(3x) + 1) = x^4 + x^2 √(3x) + x^2 - x^2 √(3x) - √(3x) + x^2 + √(3x) + 1 = x^4 + 2x^2 + 1 = (x^2 + 1)^2 3. a^2 - 2ab + b^2 - a + b = (a-b)^2 - (a-b) = (a-b)(a-b-1) 4. 3x^2 + 6x + 1 = 3(x+b)^2 + c => 3x^2 + 6x + 1 = 3x^2 + 6bx + (3b^2 + c) Comparing...
Let $x be the amount that Mary has x/2 - 120 = 39 x/2 = 159 x = 318 Hence, Mary has $318
Carmen weights y kg,Fanny is 10kg heavier than Carmen Therefore Fanny weights y+10 kg y+y+10=73 y=31.5 Fanny weights y+10 kg So Fanny weights 41.5 kg
