已知a+b=1,ab=-½,利用因式分解求a(a+b)(a-b)-a(a+b)²的值?(因式分解:求a(a+b)(a-b)-a(a+b)²过程详细点.谢)
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![已知a+b=1,ab=-½,利用因式分解求a(a+b)(a-b)-a(a+b)²的值?(因式分解:求a(a+b)(a-b)-a(a+b)²过程详细点.谢)](/uploads/image/z/643779-27-9.jpg?t=%E5%B7%B2%E7%9F%A5a%2Bb%3D1%2Cab%3D-%26%23189%3B%2C%E5%88%A9%E7%94%A8%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E6%B1%82a%EF%BC%88a%2Bb%29%28a-b%29-a%28a%2Bb%29%26%23178%3B%E7%9A%84%E5%80%BC%3F%EF%BC%88%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A%E6%B1%82a%EF%BC%88a%2Bb%29%28a-b%29-a%28a%2Bb%29%26%23178%3B%E8%BF%87%E7%A8%8B%E8%AF%A6%E7%BB%86%E7%82%B9.%E8%B0%A2%EF%BC%89)
已知a+b=1,ab=-½,利用因式分解求a(a+b)(a-b)-a(a+b)²的值?(因式分解:求a(a+b)(a-b)-a(a+b)²过程详细点.谢)
已知a+b=1,ab=-½,利用因式分解求a(a+b)(a-b)-a(a+b)²的值?
(因式分解:求a(a+b)(a-b)-a(a+b)²过程详细点.谢)
已知a+b=1,ab=-½,利用因式分解求a(a+b)(a-b)-a(a+b)²的值?(因式分解:求a(a+b)(a-b)-a(a+b)²过程详细点.谢)
a(a+b)(a-b)-a(a+b)²
=a(a+b)[(a-b)-(a+b)]
=a(a+b)(-2b)
=-2ab(a+b)
=-2×(-1/2)×1
=1
a(a+b)(a-b)-a(a+b)²
=a(a+b)[(a-b)-(a+b)]
=a(a+b)(-2b)
=-2ab(a+b)
=-2x(-1/2)x1
=2
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a(a+b)(a-b)-a(a+b)²
=a(a+b)[(a-b)-(a+b)]
=a(a+b)(-2b)
=-2ab(a+b)
=-2×(-½)×1
=1
原式=a(a+b)[(a-b)-(a+b)]=a(a+b)(a-b-a-b)=-2ab(a+b)=-2*(-1/2)*1=1
a(a+b)(a-b)-a(a+b)²
=a(a+b)((a-b)-(a+b))
=a(a+b)(-2b)
=-2*ab*(a+b)
=-2*-1/2*1
=1
a(a+b)(a-b)-a(a+b)²
=a(a+b)[(a-b)-(a+b)]
=a(a+b)(-2b)
=-2ab(a+b)
=1