1.If c>-2,the inequality 4c-2x>5c + cx is equivalent to ?
要有式...
2.Which of the following is not a factor of 54y-16y^4
要有式証明...
A. 4y^2 + 6y + 9 B. 3 + 2y C. 2 D. y
3.If x>2,then find the range of values of a such that a=5-2x.
要有式...
f3 mth questions!!!!!!!!!!
2010-11-30 3:08 am
回答 (2)
2010-11-30 3:29 am
✔ 最佳答案
1)4c - 2x > 5c + cx- 2x > c + cxc + (c+2)x < 0(c+2)x < - cSince c>-2 i.e. c+2 > 0 , so :x < - c/(c+2)x > c/(c+2)2)54y-16y^4= 2y(27 - 8y^3)= 2y[3^3 - (2y)^3]= 2y(3 - 2y)(9 + 6y + 4y^2)Sp 3 + 2y is not a factor of it.(B)
3)a = 5 - 2x2x = 5 - ax = (5 - a)/2(5 - a)/2 > 25 - a > 4a < 1
2010-11-30 3:23 am
a=5-2x
a<5-2(2)
a<1
2010-11-29 19:24:40 補充：
54y-16y^4
2y(27-8y^3)
2y(3-2y)(9+6y+y^2)
a<5-2(2)
a<1
2010-11-29 19:24:40 補充：
54y-16y^4
2y(27-8y^3)
2y(3-2y)(9+6y+y^2)
收錄日期: 2021-04-13 17:40:21
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