新SAT官方Daily Practice每日一题计算题(9.7)
- 2017年09月07日11:49 来源：小站教育作者：小站SAT编辑
- 参与（1） 阅读（4871）
Read the following SAT test question and then click on a button to select your answer.
(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.
