(x1-x2)+(x2-x1)/x1x2 = (x1-x2)(1- 1/x1x2) 请问这是怎么变形的?

问题描述:

(x1-x2)+(x2-x1)/x1x2 = (x1-x2)(1- 1/x1x2)
请问这是怎么变形的?

(x1-x2)-(x1-x2)/x1x2 = (x1-x2)(1- 1/x1x2)
1 - 1/x1x2 = 1-1/x1x2

(x1-x2)+(x2-X1)/x1x2=(x1-x2)-(x1-x2)/x1x2,提取公因式(x1-x2)得出(x1-x2)(1-1/x1x2)

提取公因式(x1-x2)