题目内容
化简求值:
(1)(2
)0.5+0.1-2-π0+
;
(2)(lg2)2+lg2lg5+
.
(1)(2
7 |
9 |
1 |
3 |
(2)(lg2)2+lg2lg5+
(lg2)2-lg4+1 |
(1)(2
)0.5+0.1-2-π0+
=(
)
+100-1+
=
+100-1+
=101;
(2)(lg2)2+lg2lg5+
=lg2(lg2+lg5)+
=lg2+(1-lg2)=1.
7 |
9 |
1 |
3 |
=(
25 |
9 |
1 |
2 |
1 |
3 |
=
5 |
3 |
1 |
3 |
(2)(lg2)2+lg2lg5+
(lg2)2-lg4+1 |
=lg2(lg2+lg5)+
(lg2-1)2 |
=lg2+(1-lg2)=1.
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