1.2008^2 -2007×2009 2.(x+3)^2-(x-1)(x-2) 3.(x ^2y) ^3·(-2y ^
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1.2008^2 -2007×2009 2.(x+3)^2-(x-1)(x-2) 3.(x ^2y) ^3·(-2y ^2)^2÷(2x^2)
1.2008^2 -2007×2009 2.(x+3)^2-(x-1)(x-2) 3.(x ^2y) ^3·(-2y ^2)^2÷(2x^2)
1.2008^2 -2007×2009 2.(x+3)^2-(x-1)(x-2) 3.(x ^2y) ^3·(-2y ^2)^2÷(2x^2)
2008^2 -2007×2009=2008^2 -(2008-1)×(2008+1)=2008^2 -(2008^2 -1)=1
(x+3)^2-(x-1)(x-2)=x^2+6x+9-(x^2-3x+2)=9x+7
(x ^2y) ^3·(-2y ^2)^2÷(2x^2)=2x^4y^7
(x+3)^2-(x-1)(x-2)=x^2+6x+9-(x^2-3x+2)=9x+7
(x ^2y) ^3·(-2y ^2)^2÷(2x^2)=2x^4y^7
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1.2008^2 -2007×2009 2.(x+3)^2-(x-1)(x-2) 3.(x ^2y) ^3·(-2y ^
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