题目内容
计算题
(1)(0.25)
-[-2×(
)0]2×[(-2)3]
+(
-1)-1-2
(2)(lg5)2+lg2×lg50.
(1)(0.25)
1 |
2 |
3 |
7 |
4 |
3 |
2 |
1 |
2 |
(2)(lg5)2+lg2×lg50.
(1)(0.25)
-[-2×(
)0]2×[(-2)3]
+(
-1)-1-2
=
-4×16+
+1-
=-
(6分)
(2)(lg5)2+lg2×lg50
=(lg5)2+lg2×(lg10+lg5)
=(lg5)2+lg2+(lg5)(lg2)
=lg5(lg5+lg2)+lg2=1(6分)
1 |
2 |
3 |
7 |
4 |
3 |
2 |
1 |
2 |
=
1 |
2 |
2 |
2 |
125 |
2 |
(2)(lg5)2+lg2×lg50
=(lg5)2+lg2×(lg10+lg5)
=(lg5)2+lg2+(lg5)(lg2)
=lg5(lg5+lg2)+lg2=1(6分)
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