先化简,再求值:(a+根号3)(a-根号3)-a(a-6),a=1/2+根号1/2

先化简,再求值:(a+根号3)(a-根号3)-a(a-6),a=1/2+根号1/2
先化简,再求值:(a+根号3)(a-根号3)-a(a-6),a=1/2+根号1/2

先化简,再求值:(a+根号3)(a-根号3)-a(a-6),a=1/2+根号1/2
a=1/2+根号1/2=1/2+√2/2
(a+根号3)(a-根号3)-a(a-6)
=a^2-3-a^2+6a
=6a-2
=3-3√2-2
=1-3√2