53. In the store of a car dealer, less than 10 cars are equipped with fog light, and 40% of the cars have **window, Is the dealer has more car with fog light than those with **window?
(1)80% cars have fog light and window
(2)52 cars have fog light or window or both
答案不知道??
**我算(B)
60. r 和 t是小於等於4的正整數，問r的-t次方最小是好多？
JJ答案: 1/rt結果為最小? 就相當rt於最大是多少…1/81
0<R=<4, 0<t=<4
1/(4)^4=1/64 我算不同答案??1/64
65. x3y^2z>0?
(1)xz<0
(2)y>0
JJ答案: 第一個單獨可以，小於零；第二個完全不可以..(A)
關鍵只要X為正即可~
我算不同~
(1)x3y*2z=X為正時, Z為負,總結果為正~
X為負時, Z為正,總結果為負~不成立~
(2)不知道Z跟Z條件,不成立~
(3) 還是無唯一解~ 選(E)
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