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).

原式=8xn+1-3xn-1+2x-18xn+1+8xn
=-10xn+1+5xn+2x-1.