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SAT官方每日一题附答案和解析[数学](2019年12月23日)
日期:2019-12-23 09:37

(单词翻译:单击)

每日一题

Mathematics>Standard Multiple Choice

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 equation above have?

A.0
B.1
C.2
D.4

答案和解析

答案:A

解析:

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

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 also real.

The equation has 1 unique real solution.

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重点单词
  • factorn. 因素,因子 vt. 把 ... 因素包括进去 vi
  • uniqueadj. 独一无二的,独特的,稀罕的
  • equationn. 相等,方程(式), 等式,均衡
  • multipleadj. 许多,多种多样的 n. 倍数,并联
  • solutionn. 解答,解决办法,溶解,溶液