(-xx+5+4x)+( 5x-4+2xx)其中x=-2
1个回答
(-x²+5+4x)+(5x-4+2x²)
=(-x²+2x²)+(4x+5x)+(5-4)
=x²+9x+1
=(-2)²+9×(-2)+1
=4-18+1
=-13
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