SAT数学练习题 含详细答案解析(5)

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要想SAT数学成绩有所提高，坚持每天做练习是十分必要的，就像这样每天完成5道SAT数学题目，并进行总结，日积月累，成绩就会有明显地提高。本文分享数学练习题的第五部分。

1. If a² = 12, then a4 =

A. 144

B. 72

C. 36

D. 24

E. 16

Correct Answer: A

解析:

a4 = a2 x a2 = 12 x 12 = 144

2. If n is even, which of the following cannot be odd?

I n + 3

II 3n

III n² - 1

A. I only

B. II only

C. III only

D. I and II only

E. I, II and III

Correct Answer: B

解析:

In case I , even plus odd will give odd. In case II, odd times even will give

even. In case III even squared is even, and even minus odd is odd. (You can

check this by using an easy even number like 2 in place of n). Only case II

cannot be odd.

3. One side of a triangle has length 8 and a second side has length 5. Which

of the following could be the area of the triangle?

I 24

II 20

III 5

A. I only

B. II only

C. III only

D. II and III only

E. I, II and III

Correct Answer: D

解析:

The maximum area of the triangle will come when the given sides are placed at

right angles. If we take 8 as the base and 5 as the height the area = ½ x 8 x 5

= 20. We can alter the angle between the sides to make it less or more than 90,

but this will only reduce the area. (Draw it out for yourself). Hence the area

can be anything less than or equal to 20.

4. A certain animal in the zoo has consumed 39 pounds of food in six days. If

it continues to eat at the same rate, in how many more days will its total

consumption be 91 pounds?

A. 12

B. 11

C. 10

D. 9

E. 8

Correct Answer: E

解析:

Food consumed per day = 39/6. In the remaining days it will consume 91 - 39

pounds = 52 pounds. Now divide the food by the daily consumption to find the

number of days. 52 / (39/6) = 52 x (6 / 39) = 8

5. A perfect cube is an integer whose cube root is an integer. For example,

27, 64 and 125 are perfect cubes. If p and q are perfect cubes, which of the

following will not necessarily be a perfect cube?

A. 8p

B. pq

C. pq + 27

D. -p

E. (p - q)6

Correct Answer: C

解析:

A perfect cube will have prime factors that are in groups of 3; for example

125 has the prime factors 5 x 5 x 5 , and 64 x 125 will also be a cube because

its factors will be 4 x 4 x 4 x 5 x 5 x 5. Consider the answer choices in turn.

8 is the cube of 2, and p is a cube, and so the product will also be a cube. pq

will also be a cube as shown above.pq is a cube and so is 27, but their sum need

not be a cube. Consider the case where p =1 and q = 8, the sum of pq and 27 will

be 35 which has factors 5 x 7 and is not a cube. -p will be a cube. Since the

difference between p and q is raised to the power of 6, this expression will be

a cube (with cube root = difference squared).