新SAT官方Daily Practice每日一题计算题(9.7)

小站教育2017-09-07 11:49:09

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摘要:本系列将给大家带来SAT官方的每日一练数学真题,各题型都有,持续更新,希望大家同步多练习。今天这里分享的是9月7日的数学计算题,一起来练习吧!

Read the following SAT test question and then click on a button to select your answer.

9月SAT数学官方每日一练,点击进入

(x+10000)(x+10000)=0

How many unique real solutions does the equationabove have?

A.0

B.1

C.2

D.4

重点单词:

solution [sə'lu:ʃən]n. 解答,解决办法,溶解,溶液

multiple ['mʌltipl]adj. 许多,多种多样的n. 倍数,并联

unique [ju:'ni:k]adj. 独一无二的,独特的,稀罕的

equation [i'kweiʃən]n. 相等,方程(式), 等式,均衡

factor ['fæktə]n. 因素,因子

答案:B

解析:

Choice B is correct. The left-hand side of theequation can only be zero when one of the factors iszero.

If the first factor is zero, then x=-10000.

If the second factor is zero, then x=-10000.

These are both the same solution. So there is only 1 unique solution. This solution is alsoreal.

The equation has 1 unique real solution.

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