a(a-b)-a+b,其中a=-1,b=-1/2 提公因式?
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a(a-b)-a+b
=a(a-b)-(a-b)
=(a-1)(a-b)
=(-1-1)(-1+1/2)
=-2x-1/2
=1,1,a=-1,b=-1/2
a(a-b)-a+b=a*a-ab-a+b
=(-1)*(-1)-(-1)*(-1/2)-(-1)+(-1/2)
=1-1/2+1-1/2
=1,2,a(a-b)-a+b
=a(a-b)-(a-b)
=(a-b)(a-1)
=[-1-(-1/2)](-1-1)
=[-1+1/2](-2)
=(-1/2)*(-2)
=1,0,
=a(a-b)-(a-b)
=(a-1)(a-b)
=(-1-1)(-1+1/2)
=-2x-1/2
=1,1,a=-1,b=-1/2
a(a-b)-a+b=a*a-ab-a+b
=(-1)*(-1)-(-1)*(-1/2)-(-1)+(-1/2)
=1-1/2+1-1/2
=1,2,a(a-b)-a+b
=a(a-b)-(a-b)
=(a-b)(a-1)
=[-1-(-1/2)](-1-1)
=[-1+1/2](-2)
=(-1/2)*(-2)
=1,0,
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