若2x+3y-4=0,求9x-1•27y.
问题描述:
若2x+3y-4=0,求9x-1•27y.
答
∵2x+3y-4=0,
∴2x+3y=4,
∴9x-1•27y=32x-2•33y=32x+3y-2=32=9.