题目内容
计算下列各题:
①0.0081
+(4-
)2+(
)-
-16-0.75
②lg25+lg2lg50+21+
log25
①0.0081
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②lg25+lg2lg50+21+
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①原式=(0.3)4×
+(2-
)2+(2
)-
-24×(-0.75)=0.3+2-3+2-2-2-3=0.3+0.25=0.55
②原式=lg25+2lg2lg5+lg22+21•2
log25=(lg5+lg2)2+21•2log2
=1+2
所以①的值为:0.55.②的值为:1+2
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②原式=lg25+2lg2lg5+lg22+21•2
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所以①的值为:0.55.②的值为:1+2
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