标题: GWD10-13 (高次方相加減) [打印本页] 作者: Kath1985 时间: 2010-3-24 15:21 标题: GWD10-13 (高次方相加減) Which of the following is equal to (2^12-2^6) / (2^6-2^3) ? 答案為2^6+2^3 想請問這種題目要如何做呢作者: annedx 时间: 2010-3-24 15:28
For numerator, you can get a common factor --> 2^6 out of the equation. In other words, 2^12-2^6=2^6(2^6-1)=2^6*(2^3-1)(2^3+1) for denominator, likewise, you could get 2^3 out. rewrite the equation, you got 2^6-2^3=2^3*(2^3-1) and blah blah blah you get 2^3*(2^3+1)=2^6+2^3 .... 作者: Kath1985 时间: 2010-3-24 15:48
喔 我懂了 哈哈 謝謝你
