x(x的平方-4)-(x+3)(x的平方-3x+2)-2x(x-2).其中x=2分之3
2个回答
2013-12-05
展开全部
x(x的平方-4)-(x+3)(x的平方-3x+2)-2x(x-2)
=x(x+2)(x-2)-(x+3)(x-1)(x-2)-2x(x-2)
=(x-2)(x^2+2x-x^2-2x+3-2x)
=(x-2)(3-2x)
x=2分之3
=(3/2-2)(3-2*3/2)
=(-1/3)*(3-3)
=0
=x(x+2)(x-2)-(x+3)(x-1)(x-2)-2x(x-2)
=(x-2)(x^2+2x-x^2-2x+3-2x)
=(x-2)(3-2x)
x=2分之3
=(3/2-2)(3-2*3/2)
=(-1/3)*(3-3)
=0
2013-12-05
展开全部
先把代数式化简:
x(x的平方-4)-(x+3)(x的平方-3x+2)-2x(x-2)
=x(x+2)(x-2)-(x+3)(x-1)(x-2)-2x(x-2)
=(x-2)[x(x+2)-(x+3)(x-1)-2x]
=(x-2)(x^2+2x-x^2-2x+3-2x)
=(x-2)(3-2x)
把 x=3/2代入上式得:
(3/2-2)(3-2*3/2)
=-1/2*0=0 .
x(x的平方-4)-(x+3)(x的平方-3x+2)-2x(x-2)
=x(x+2)(x-2)-(x+3)(x-1)(x-2)-2x(x-2)
=(x-2)[x(x+2)-(x+3)(x-1)-2x]
=(x-2)(x^2+2x-x^2-2x+3-2x)
=(x-2)(3-2x)
把 x=3/2代入上式得:
(3/2-2)(3-2*3/2)
=-1/2*0=0 .
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