標題:
F.4 math........show步驟.......**附答案ga**
http://x06.xanga.com/979c403713d30189511180/b145769122.jpg 有答案ga la~~ 可唔可以step by step話我知點做...!? ^^" 唔該晒!!* 更新: 我唔明3(c)(iii)果題...點解佢地when y=0 的時候,,都會x=-1........ y=-(x+1)..lee個,,乜唔係響1咩..點解都會係-1...? 仲有le..0以下ge唔洗畫....y??
最佳解答:
3(c)(iii) when x<-1 , y=-(x+1) when x>-1 , y=x+1 And then you can draw the graph easily 4(a) First you draw the y=x^2 and x+y=2 Then substitute(3,0), then 0<=9 and 3+0>=2 So you can find the suitable half-plane of the equation y<=x^2 and x+y>=2 The required region is the intersection of these two which is your graph provided. 2nPn=8(2n-1)P(n-1) 2n(2n-1)...(2n-n+1)=8(2n-1)(2n-2)...(2n-1-n+1+1) 2n(2n-1)...(n+1)=8(2n-1)(2n-2)...(n+1) 2n=8 n=4 2(a) 3/(x-1)<=2 3(x-1)<=2(x-1)^2 (x-1)[2(x-1)-3]>=0 (x-1)[2x-5]>=0 x<=1 or x>=5/2 But when x=1 (x-1) is undifined So the solution is x<1 and x>=5/2 (ii) 49^(-1/2)*27^(2/3) =1/[49^(1/2)]* 27^(2/3) =1/[49^(1/2)]* [27^(1/3)]^2 =3^2/7 =9/7 2008-05-18 18:39:18 補充： 因為yahoo故意將> 變成>, <變成>﹐期望人去手機認證。但是我無手機所以無辦法﹐亦不會因為無<功能而不答問題 2008-05-18 19:44:37 補充： y=|x+1| if y=0, then |x+1|=0 So x=-1 |x| should be >=0 for any value of x!!!!
其他解答:
49^-1/2 x 27^2/3 = 27^2/3 / (49^1/2) = 3^2 / 7 9/7
F.4 math........show步驟.......**附答案ga**
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發問:http://x06.xanga.com/979c403713d30189511180/b145769122.jpg 有答案ga la~~ 可唔可以step by step話我知點做...!? ^^" 唔該晒!!* 更新: 我唔明3(c)(iii)果題...點解佢地when y=0 的時候,,都會x=-1........ y=-(x+1)..lee個,,乜唔係響1咩..點解都會係-1...? 仲有le..0以下ge唔洗畫....y??
最佳解答:
3(c)(iii) when x<-1 , y=-(x+1) when x>-1 , y=x+1 And then you can draw the graph easily 4(a) First you draw the y=x^2 and x+y=2 Then substitute(3,0), then 0<=9 and 3+0>=2 So you can find the suitable half-plane of the equation y<=x^2 and x+y>=2 The required region is the intersection of these two which is your graph provided. 2nPn=8(2n-1)P(n-1) 2n(2n-1)...(2n-n+1)=8(2n-1)(2n-2)...(2n-1-n+1+1) 2n(2n-1)...(n+1)=8(2n-1)(2n-2)...(n+1) 2n=8 n=4 2(a) 3/(x-1)<=2 3(x-1)<=2(x-1)^2 (x-1)[2(x-1)-3]>=0 (x-1)[2x-5]>=0 x<=1 or x>=5/2 But when x=1 (x-1) is undifined So the solution is x<1 and x>=5/2 (ii) 49^(-1/2)*27^(2/3) =1/[49^(1/2)]* 27^(2/3) =1/[49^(1/2)]* [27^(1/3)]^2 =3^2/7 =9/7 2008-05-18 18:39:18 補充： 因為yahoo故意將> 變成>, <變成>﹐期望人去手機認證。但是我無手機所以無辦法﹐亦不會因為無<功能而不答問題 2008-05-18 19:44:37 補充： y=|x+1| if y=0, then |x+1|=0 So x=-1 |x| should be >=0 for any value of x!!!!
其他解答:
49^-1/2 x 27^2/3 = 27^2/3 / (49^1/2) = 3^2 / 7 9/7
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