已知xx+5x-990=0,试求xxx+6xx-985x+1009的值
问题描述:
已知xx+5x-990=0,试求xxx+6xx-985x+1009的值
答
xxx+6xx-985x+1009
=x(xx+6x-985)+1009
=X(xx+5x-990+x+5)+1009
=x(x+5)+1009
=xx+5x-990+990+1009
=1999