计算（x/x-2 - x/x+2）除以4x/x2-4

分类: 作业答案 • 2021-12-23 14:35:00

问题描述：

答

3/2

答

原式=x[(x+2-x+2)/(x+2)(x-2)*(x+2)(x-2)/4x
=4x//(x+2)(x-2)*(x+2)(x-2)/4x
=1

答

（x/x-2 - x/x+2）除以4x/x²-4
=（x²+2x-x²+2x)/(x²-4)÷[4x/(x²-4)]
=4x/(x²-4)÷[4x/(x²-4)]
=1