2(x+4)^2-(x+5)^2-(x+3)(x-3)怎么化简?有没有简便方法
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2(x+4)^2-(x+5)^2-(x+3)(x-3)怎么化简?有没有简便方法2(x+4)^2-(x+5)^2-(x+3)(x-3)怎么化简?有没有简便方法2(x+4)^2-(x+5)^2-(x+3)
2(x+4)^2-(x+5)^2-(x+3)(x-3)怎么化简?有没有简便方法
2(x+4)^2-(x+5)^2-(x+3)(x-3)怎么化简?有没有简便方法
2(x+4)^2-(x+5)^2-(x+3)(x-3)怎么化简?有没有简便方法
2(x+4)^2-(x+5)^2-(x+3)(x-3) =(x+4)^2-(x+5)^2+(x+4)^2-(x^2-9) =(x+4+x+5)(x+4-x-5)+(x+4)^2-x^2+9 =(2x+9)(-1)+(x+4-x)(x+4+x)+9 =-2x-9+4(2x+4)+9 =-2x+4(2x+4) =6x+16
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