问题
解答题
计算题 (1)(0.25)
(2)(lg5)2+lg2×lg50. |
答案
(1)(0.25)
-[-2×(1 2
)0]2×[(-2)3]3 7
+(4 3
-1)-1-22 1 2
=
-4×16+1 2
+1-2
=-2
(6分)125 2
(2)(lg5)2+lg2×lg50
=(lg5)2+lg2×(lg10+lg5)
=(lg5)2+lg2+(lg5)(lg2)
=lg5(lg5+lg2)+lg2=1(6分)