题目内容
(1)化简:
÷(1-
)•a
+(π-1)0
(2)求值:(lg5)2+lg2•lg50+log2
•log3
•log5
.
a
| ||||||||
4b
|
2b
| ||
a
|
1 |
3 |
(2)求值:(lg5)2+lg2•lg50+log2
1 |
25 |
1 |
8 |
1 |
9 |
(1)
÷(1-
)•a
+(π-1)0
=
÷(
)•a
+1=a+1
(2)(lg5)2+lg2•lg50+log2
•log3
•log5
=(1-lg2)2+lg2(2-lg2)+
•
•
=1+
•
•
=1+(-2)×(-3)×(-2)
=-11
a
| ||||||||
4b
|
2b
| ||
a
|
1 |
3 |
=
a
| ||||||||||||||
4b
|
a
| ||||
a
|
1 |
3 |
(2)(lg5)2+lg2•lg50+log2
1 |
25 |
1 |
8 |
1 |
9 |
=(1-lg2)2+lg2(2-lg2)+
lg
| ||
lg2 |
lg
| ||
lg3 |
lg
| ||
lg5 |
=1+
2lg2-2 |
lg2 |
-3lg2 |
lg3 |
-2lg3 |
1-lg2 |
=1+(-2)×(-3)×(-2)
=-11
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