问题
解答题
计算: (1)(2
(2)(lg5)2+lg2×lg50. |
答案
(1)(2
)1 4
-(-9.6)0-(31 2
)-3 8
+(1.5)-2=2 3
-1-(3 2
)-2+(3 2
)-2=3 2
.1 2
(2)(lg5)2+lg2×lg50
=(lg5)2+lg2×lg(25×2)
=(lg5)2+lg2×(2lg5+lg2)
=(lg5)2+2lg2×lg5+(lg2)2
=(lg2+lg5)2
=1