</p> 16.In a list of numbers, the first number is 3, the second is 4, and each subsequent number is the sum of all the preceding numbers in the list. If the 20th number in the list is x, what is the 25th number in the list?
" t# [4 r* L' D9 |" S0 F A.7x
+ l! V( F& U7 ` B.16x
6 Z8 k3 {- E5 g. z" m C.32x
) c2 }% \9 k; B o2 P D.35x
* Q8 n, v) l6 u, K. g: P* v E.161x
0 K5 k( t6 F c 答案:C$ S$ R4 i9 v+ T& r
17.Which of the following numbers is both a factor of 48 and a multiple of 6?
& `3 l6 k! V* r) }. R3 q A.2( q$ E8 P* n5 i1 `
B.8) e: H/ m/ n, G1 x4 w2 h
C.12, Q/ l M" q% g" e( q" Y
D.16
) I4 f0 H2 J) S" _" m E.18* T% d* n# J) E& u) J. T
答案:C
' V% A9 t: R: f3 A, D2 Y& ]. c 18.The least common denominator of 1/2,1/3,and1/4
% ^+ u' ^/ d% h+ v 15
/ ], J2 V. y3 t! v 答案:B" b' a! [" ~, s( m5 a' h3 R5 k
19.If r and s are positive integers, each greater than 1, and if 11(s-1)=13(r-1), what is the least possible value of r+s?" r% @5 m" r; p/ R* T% U- k
A.26 A! v9 r4 k( I- X( j* c) {
B.11) D/ I" T$ |) i3 e& j* q
C.224 [3 m- e# c) r6 v3 ?; p+ [
D.241 c% {. J& K( V/ M
E.26
# D9 O: p* ~5 y8 ? 答案:E
5 n( r7 B- Q" y$ m: J# F4 C5 r 20.When integer n is divided by 9, the remainder is 2.
" W" {. z7 j, B/ O The remainder when n is divided by 3
8 z _, k3 N7 A2 z) l 2/ u9 _3 F: O. U" e6 l9 b7 R6 W
答案:C |