2-x分之x-x²-4x+4分之4-x²
问题描述:
2-x分之x-x²-4x+4分之4-x²
答
2-x分之x-x²-4x+4分之4-x²
=-x/(x-2) +(x²-4)/(x²-4x+4)
=-x/(x-2) +(x+2)(x-2)/(x-2)²
=-x/(x-2) +(x+2)/(x-2)
=2/(x-2)