若x-3y+2=0,则11-3x+9y的值为多少
问题描述:
若x-3y+2=0,则11-3x+9y的值为多少
答
11-3x+9y = 11 -3(x-3y+2) + 6 = 11 - 0 + 6 = 17
若x-3y+2=0,则11-3x+9y的值为多少
11-3x+9y = 11 -3(x-3y+2) + 6 = 11 - 0 + 6 = 17