1.On a certain number line, if-7 is a distance 4 from n and 7 is a distance of 18 from n then n=
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4 D. C/ j- ]0 R$ L+ Y" g+ H C.3
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E.-11
* g7 E6 X0 \5 |0 {1 t- W 答案:E
{( Z. S! y+ Z, b* R7 f 2. Which of the following equations can be used to find the value of x if 7 less than 5x is 5 more the product of 3 and x?
6 B: [6 x- J& m" s) o# R9 n A.5x-7=5+3x( q0 x- a2 @1 }
B.5x-7=5+(3+x)
( T4 \1 o2 U- W r5 P) T C.7-5x=5+3x
2 I9 M1 T' i) K5 W D.7-5x=(5+3)x
1 F1 O J' R# I' r% g( r E.7-5x+5=3x) G Z+ A1 P* u+ e( }4 h+ T
答案:A3 M1 @5 K0 I: S1 ]
3.On a number line, the distance between the two points with coordinates -5 and 1 is how much less than the distance between the two points with coordinates 2 and 14?
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B.8& {5 O% q9 e f: O" I
C.10
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E.16
7 j/ U& g6 ^& \2 S& d0 O/ K 答案:A D& ~, M$ U, l b
4.The expression (4+x)(2x-3) is equivalent to which of the following?
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(2)(x-4)(2x+3)
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A.(1) only5 i0 Y3 z) W! O w" ]. k
B. (2) only
3 N3 N* J# I- `0 [ a( z$ k& T5 c6 Q C. (3) only( K/ Z, ~& Z0 c& A
D. (2) and (3)only
. Z, O& e( C+ ?, l% C E. (1),(2) and (3)
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4 {& Z$ t7 z; e3 p* Y5 Y 答案;A |