问题
解答题
(1)计算:2log32-log3
(2)已知x=27,y=64.化简并计算:
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答案
(1)2log32-log3
+log38-25log53.32 9
=log34-log3
+log38-52log5332 9
=log3(4×
×8)-5log599 32
=log39-9=2-9=-7.
(2)∵x=27,y=64,
∴5x-
y2 3 1 2 (-
x-1y1 4
)(-1 2
x5 6
y-1 3
)1 6
=5x-
y2 3 1 2 (-
)×(-1 4
)×x-1+5 6
×y1 3
-1 2 1 6
=5x-
•y2 3 1 2
×x-5 24
×y2 3 1 3
=24y 1 6
=24×(26) 1 6
=48.