计算题:(8xn+1-3xn-1)-2(-x+9xn+1-4xn).
问题描述:
计算题:(8xn+1-3xn-1)-2(-x+9xn+1-4xn).
答
原式=8xn+1-3xn-1+2x-18xn+1+8xn.
=-10xn+1+5xn+2x-1.