怎么化简?
2个回答
展开全部
(x-1)(x+4)- { (x+2)(x-5) - [ (x+3)(x-4)-(x-1)(x+6)] }
=(x-1)(x+4)- { (x+2)(x-5) - [ (x^2-x-12)-(x^2+5x-6)] }
=(x-1)(x+4)- { (x+2)(x-5) - (-6x-18) }
=(x-1)(x+4)- { x^2-3x-10 - (-6x-18) }
=(x-1)(x+4)- { x^2+3x+8 }
=x^2+3x-4 -{ x^2+3x+8 }
=-12
=(x-1)(x+4)- { (x+2)(x-5) - [ (x^2-x-12)-(x^2+5x-6)] }
=(x-1)(x+4)- { (x+2)(x-5) - (-6x-18) }
=(x-1)(x+4)- { x^2-3x-10 - (-6x-18) }
=(x-1)(x+4)- { x^2+3x+8 }
=x^2+3x-4 -{ x^2+3x+8 }
=-12
追问
没算对吧?答案是0.
追答
不好意思
(x-1)(x+4)- { (x+2)(x-5) - [ (x+3)(x-4)-(x-1)(x+6)] }
=(x-1)(x+4)- { (x+2)(x-5) - [ (x^2-x-12)-(x^2+5x-6)] }
=(x-1)(x+4)- { (x+2)(x-5) - (-6x-6) }
=(x-1)(x+4)- { x^2-3x-10 - (-6x-6) }
=(x-1)(x+4)- { x^2+3x+4 }
=x^2+3x-4 -{ x^2+3x+4 }
=0
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展开全部
(x-1)(x+4)- { (x+2)(x-5) - [ (x+3)(x-4)-(x-1)(x+6)] }
=(x-1)(x+4)-(x+2)(x-5)+(x+3)(x-4)-(x-1)(x+6)
=[(x-1)(x+4)-(x-1)(x+6)]-(x+2)(x-5)+(x+3)(x-4)
=(x-1)(x+4-x-6)-(x²-3x-10)+(x²+7x+12)
=-2x+2-x²+3x+10+x²+7x+12
=8x+14
=(x-1)(x+4)-(x+2)(x-5)+(x+3)(x-4)-(x-1)(x+6)
=[(x-1)(x+4)-(x-1)(x+6)]-(x+2)(x-5)+(x+3)(x-4)
=(x-1)(x+4-x-6)-(x²-3x-10)+(x²+7x+12)
=-2x+2-x²+3x+10+x²+7x+12
=8x+14
追问
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