化简,求值x的2次方-16/8-2x,x=-2
问题描述:
化简,求值x的2次方-16/8-2x,x=-2
答
(x^2-16)/(8-2x)
=(x+4)(x-4)/(-2(x-4))
=-(x+4)/2
=-(-2+4)/2
=-2/2
=-1