2015年ACT考試數學習題及解析(5)

2015/04/13 瀏覽次數:9 收藏
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  網ACT測驗頻道小編為考生們匯集了ACT測驗數學演習題,快快練起來吧!

  3x3·2x2y·4x2y is equivalent to:

  A. 9x7y2

  B. 9x12y2

  C. 24x7y2

  D. 24x12y

  E. 24x12y2

  剖析:The correct answer is C. To find an equivalent expression, you can multiply the constants (3·2·4), combine the x term (x3x2x2 → x3+2+2 → x7, because when you have a common base you use the base and add the exponents), and combine the y terms (y·y → y1y1 → y1+1 → y2). The result is 24x7y2.

  準確謎底選C。常數相乘(3·2·4),歸並x項(x3x2x2 → x3+2+2 → x7) 和y項(y·y → y1y1 → y1+1→ y2),成果為24x7y2。