问题
解答题
计算下列各式 (1)log2(47×25)+log26-log23 (2)
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答案
(1)log2(47×25)+log26-log23=log2(47×25)+log22=log2(214×25)+log22=20;
(2)
=3 x y2
• 6 x5 4 y3
=x (xy2) 1 3 x
y 5 6 3 4
-1 3
•y 5 6
-2 3
=x -3 4
•y -1 2
(x>0,y>0)1 12