问题
解答题
计算 (1)(log43+log83)(log32+log92) (2)(
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答案
计算(每小题(4分),共8分)
(1)(log43+log83)(log32+log92)=(
log23+1 2
log23)(log32+1 3
log32)=1 2
log23×(5 6
log32)=3 2
×5 6
=3 2
.5 4
(2)原式=(
)2+1-(3 2
)27 8
=2 3
+1-(9 4
)3×3 2
=2 3
+1-9 4
=1.9 4