问题
解答题
(1)化简:
(2)求值:(lg5)2+lg2•lg50+log2
|
答案
(1)
÷(1-a
(a-8b)1 3 4b
+2a2 3
b1 3
+a1 3 2 3
)•a2b 1 3 a 1 3
+(π-1)01 3
=
÷(a
(a1 3
-(2b)1 3
) (4b1 3
+2a2 3
b1 3
+a1 3
) 2 3 4b
+2a2 3
b1 3
+a1 3 2 3
)•aa
-2b1 3 1 3 a 1 3
+1=a+11 3
(2)(lg5)2+lg2•lg50+log2
•log31 25
•log51 8 1 9
=(1-lg2)2+lg2(2-lg2)+
•lg 1 25 lg2
•lg 1 8 lg3 lg 1 9 lg5
=1+
•2lg2-2 lg2
•-3lg2 lg3 -2lg3 1-lg2
=1+(-2)×(-3)×(-2)
=-11