题目内容
(1)求值:(2
)
-(-2008)0-(3
)-
+(
)-2;
(2) 求值:(lg5)2+lg2×lg50.
1 |
4 |
1 |
2 |
3 |
8 |
2 |
3 |
3 |
2 |
(2) 求值:(lg5)2+lg2×lg50.
(1)(2
)
-(-2008)0-(3
)-
+(
)-2
=(
)
-1-(
)-
+(
)2
=
-1-(
)
+
=
-
+
=
(2)(lg5)2+lg2×lg50=(lg5)2+lg2×(lg5+1)
=(lg5)2+lg2×lg5+lg2
=(lg5+lg2)×lg5+lg2
=1×lg5+lg2
=1.
1 |
4 |
1 |
2 |
3 |
8 |
2 |
3 |
3 |
2 |
=(
9 |
4 |
1 |
2 |
27 |
8 |
2 |
3 |
2 |
3 |
=
3 |
2 |
8 |
27 |
2 |
3 |
4 |
9 |
=
1 |
2 |
4 |
9 |
4 |
9 |
=
1 |
2 |
(2)(lg5)2+lg2×lg50=(lg5)2+lg2×(lg5+1)
=(lg5)2+lg2×lg5+lg2
=(lg5+lg2)×lg5+lg2
=1×lg5+lg2
=1.
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