a ²-a-4=0 a ²-2(a ²-a +3)-½(a ²-a-4)-a急!已知a ²-a-4=0求 a ²-2(a ²-a +3)-½(a ²-a-4)-a
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![a ²-a-4=0 a ²-2(a ²-a +3)-½(a ²-a-4)-a急!已知a ²-a-4=0求 a ²-2(a ²-a +3)-½(a ²-a-4)-a](/uploads/image/z/7125591-39-1.jpg?t=a+%26%23178%3B-a-4%3D0+a+%26%23178%3B-2%EF%BC%88a+%26%23178%3B-a+%2B3%EF%BC%89-%26%23189%3B%28a+%26%23178%3B-a-4%EF%BC%89-a%E6%80%A5%21%E5%B7%B2%E7%9F%A5a+%26%23178%3B-a-4%3D0%E6%B1%82+a+%26%23178%3B-2%EF%BC%88a+%26%23178%3B-a+%2B3%EF%BC%89-%26%23189%3B%28a+%26%23178%3B-a-4%EF%BC%89-a)
a ²-a-4=0 a ²-2(a ²-a +3)-½(a ²-a-4)-a急!已知a ²-a-4=0求 a ²-2(a ²-a +3)-½(a ²-a-4)-a
a ²-a-4=0 a ²-2(a ²-a +3)-½(a ²-a-4)-a急!
已知a ²-a-4=0求 a ²-2(a ²-a +3)-½(a ²-a-4)-a
a ²-a-4=0 a ²-2(a ²-a +3)-½(a ²-a-4)-a急!已知a ²-a-4=0求 a ²-2(a ²-a +3)-½(a ²-a-4)-a
a ²-a-4=0
故
a ²-2(a ²-a +3)-½(a ²-a-4)-a
= (a ²-a)-2(a ²-a +3)-½(a ²-a-4)
=(a ²-a-4)+4-2(a ²-a -4+7)-½(a ²-a-4)
=0+4-2×7-1/2×0
=-10