问题
解答题
求下列式子的值: (1)(2
(2)(log43+log83)(log32+log92) |
答案
(1)原式=[(
)2]3 2
-1-[(1 2
)-3]-2 3
+(2 3
)-2=3 2
-1-(3 2
)2+(2 3
)2=2 3
;1 2
(2)原式=(
+lg3 2lg2
)(lg3 3lg2
+lg2 lg3
)=(lg2 2lg3
+1 2
)(1+1 3
)=1 2
.5 4