问题
解答题
计算下列各式的值: (1)0.064
(2)lg25+lg2•lg50+9log32+log7
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答案
(1)原式=[(0.4)3]
-1+(24)1 3
+[(0.5)2]3 4 1 2
=0.4-1+23+0.5
=7.9.
(2)原式=lg25+lg2•lg(52×2)+32log32+log773
=lg25+lg2(2lg5+lg2)+3log34+log773 2
=(lg5+lg2)2+4+3 2
=1+4+3 2
=
.13 2