GWD 18-9

songyeonpp

Q9:

Is x < 0 ?

(1) x³ < x^2>>

(2) x³ < x⁴

^{ANS : C}

hebbechou

1. x^2(x-1)<0 => x<1 && x<>0 insufficient

2. x^3(1-x)<0 => x<0 || x>1 insufficient

1&2: x<0 DONE!

songyeonpp

谢谢GG.

偶又傻掉了

mandyuuqq

1. x^2(x-1)<0 => x<1 && x<>0 insufficient -->是不是寫錯了?應該是x<1而已,所以(1)insufficient

2. x^3(1-x)<0 => x<0 || x>1 insufficient