计算:(5x的2次方-2x+3)-3(1-2x+x2次方)

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计算:(5x的2次方-2x+3)-3(1-2x+x2次方)
计算:(5x的2次方-2x+3)-3(1-2x+x2次方)

计算:(5x的2次方-2x+3)-3(1-2x+x2次方)
(5x的2次方-2x+3)-3(1-2x+x2次方)
=(5x^2-2x+3)-3(1-2x+x^2)
=(5x^2-2x+3)-(3-6x+3x^2)
=5x^2-2x+3-3+6x-3x^2
=2x^2+4x
=2x(x+2)

(5x^2-2x+3)-3(1-2x+x^2)
=5x^2-2x+3-3+6x-3x^2
=5x^2-3x^2+6x-2x+3-3
=2x^2+4x