x²-4分之4 + x+2分之1 化简计算
问题描述:
x²-4分之4 + x+2分之1 化简计算
答
解
4/(x²-4)+1/(x+2)
=4/(x-2)(x+2)+(x-2)/(x-2)(x+2)
=[4+(x-2)]/(x-2)(x+2)
=(x+2)/(x-2)(x+2)
=1/(x-2)