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计算:(1)(lg2)2+lg2×lg50+lg25;(2)2log214+(916)12+lg20−lg2−(log32)(log23)+(2−1)lg1.

题目详情
计算:(1)(lg2)2+lg2×lg50+lg25;
(2)2log2
1
4
+(
9
16
)
1
2
+lg20−lg2−(log32)(log23)+(
2
−1)lg1.
▼优质解答
答案和解析
(1)(lg2)2+lg2×lg50+lg25
=(lg2)2+lg2×(lg5+1)+2lg5
=lg2(lg2+lg5+1)+2lg5
=2lg2+2lg5
=2.
(2)2log2
1
4
+(
9
16
)
1
2
+lg20−lg2−(log32)(log23)+(
2
−1)lg1
=
1
4
+
3
4
+1−1+1
=2.