x²-2x=3,则5x²-10x+1
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x²-2x=3,则5x²-10x+1x²-2x=3,则5x²-10x+1x²-2x=3,则5x²-10x+15x²-10x+1=5
x²-2x=3,则5x²-10x+1
x²-2x=3,则5x²-10x+1
x²-2x=3,则5x²-10x+1
5x²-10x+1
=5(x²-2x)+1
∵x²-2x=3
∴原式=5×3+1=16
5x²-10x+1=5(x²-2x)+1=5*3+1=16
5x^2-10x+1=5(x^2-2x)+1=5*3+1=16