x²-2x=3,则5x²-10x+1

问题描述:

x²-2x=3,则5x²-10x+1

5x^2-10x+1=5(x^2-2x)+1=5*3+1=16

5x²-10x+1=5(x²-2x)+1=5*3+1=16

5x²-10x+1
=5(x²-2x)+1
∵x²-2x=3
∴原式=5×3+1=16