先化简,再求值:(a-√3)(a+√3)-a(a-6),其中a=√5+(1/2).
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先化简,再求值:(a-√3)(a+√3)-a(a-6),其中a=√5+(1/2).
先化简,再求值:(a-√3)(a+√3)-a(a-6),其中a=√5+(1/2).
先化简,再求值:(a-√3)(a+√3)-a(a-6),其中a=√5+(1/2).
(a-√3)(a+√3)-a(a-6)
=a²-(√3)²-a²+6a
=a²-3-a²+6a
=6a-3
=6×(√5+1/2)-3
=6√5+3-3
=6√5
=a2-3-a2+6a=6a-3,将a带入就可以了
原式=a²-(√3)²-a²+6a
=6a-3
=6(√5+1/2)-3
=6√5+3-3
=6√5