已知实数a满足a²+2a-8=0,求(a+1)分之1-(a²-1)分之(a+3)÷(a-1)分之(a+1)的值
问题描述:
已知实数a满足a²+2a-8=0,求(a+1)分之1-(a²-1)分之(a+3)÷(a-1)分之(a+1)的值
答
a²+2a-8=0(a+4)(a-2)=0a1=-4a2=2(a+1)分之1-(a²-1)分之(a+3)÷(a-1)分之(a+1)=(a+1)分之1-(a²-1)分之(a+3)×(a+1)分之(a-1)=(a+1)分之1-(a+1)分之(a+3)×(a+1)分之1=(...