化簡[(x的平方-4)/(x的平方-4X+4)+(2-X)/(X+2)]÷x/(x-2) 的結果是?
題目:
化簡[(x的平方-4)/(x的平方-4X+4)+(2-X)/(X+2)]÷x/(x-2) 的結果是?
解答:
[(x的平方-4)/(x的平方-4X+4)+(2-X)/(X+2)]÷x/(x-2)
= [(x+2)(x-2)/(x-2)^2 -(x-2)/(x+2)] × (x-2)/x
= [(x+2)/(x-2) -(x-2)/(x+2)] × (x-2)/x
= [(x+2)^2 -(x-2)^2] / [(x+2)(x-2)] × (x-2)/x
= 8x / [(x+2)(x-2) × (x-2)/x
= 8 / (x+2)
- 上一篇 煮雞蛋開水下鍋可以嗎?如題 謝謝了
- 下一篇 persons的同義詞是什麼
添加新評論