上式化简=2x/(x-2)(x+2)-1/(x-2) (提取公因式)
=1/(x-2)乘以[2x/(x+2)-1]
= 1/(x-2)乘上(2x-x-2)/(x+2) (通分)
=1/(x-2)乘上(x-2)/(x+2) (约分)
=1/ (x+2) (将x带如等式)
=2/5
上式化简=2x/(x-2)(x+2)-1/(x-2) (提取公因式)
=1/(x-2)乘以[2x/(x+2)-1]
= 1/(x-2)乘上(2x-x-2)/(x+2) (通分)
=1/(x-2)乘上(x-2)/(x+2) (约分)
=1/ (x+2) (将x带如等式)
=2/5