Question

若2x-3=1，y²-y=2，則3y²+2x²y-9y-（2y-x）的值為______．

Answer 1

∵2x-3=1，
∴x=2，
∵3y²+2x²y-9y-（2y-x）=3y²+8y-9y-（2y-2）
=3y²+8y-9y-2y+2
=3y²-3y+2
=3（y²-y）+2
=3×2+2
=8．
故答案為8．