(﹣x²+2x+5)+(4x²-3-6x)
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(﹣x²+2x+5)+(4x²-3-6x)(﹣x²+2x+5)+(4x²-3-6x)(﹣x²+2x+5)+(4x²-3-6x)(-x
(﹣x²+2x+5)+(4x²-3-6x)
(﹣x²+2x+5)+(4x²-3-6x)
(﹣x²+2x+5)+(4x²-3-6x)
(-x²+2x+5)+(4x²-3-6x)
=-x²+2x+5+4x²-3-6x
=3x²-4x+2
原式=﹣x²+2x+5+4x²-3-6x
=3x²-4x+2
(﹣x²+2x+5)+(4x²-3-6x)
=﹣x²+2x+5+4x²-3-6x
=3x²-4x+2