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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。