问题
解答题
(1)求(log43+log83)(log32+log92)-log
(2)已知a-a-1=1,求
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答案
(1)∵(log43+log83)(log32+log92)-log1 2 4 8
=(
+1 2
)log23•(1+1 3
)log32+log221 2 3 4
=
×5 6
+3 2 3 4
=2;
(2)∵a-
=1,1 a
∴a2+a-2-2=1,
∴a2+a-2=3,
∴a2+a-2-3=0,
∴
=0.(a3+a-3)(a2+a-2-3) a4-a-4