计算1.2log以5为底10+log以5为底0.25 2.已知lg2=0.3010,lg3=0.4771,求lg根号下45 3.【(1-log以6为底3)²+log以6为底2*log以6为底18】*log以4为底6
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![计算1.2log以5为底10+log以5为底0.25 2.已知lg2=0.3010,lg3=0.4771,求lg根号下45 3.【(1-log以6为底3)²+log以6为底2*log以6为底18】*log以4为底6](/uploads/image/z/3937064-32-4.jpg?t=%E8%AE%A1%E7%AE%971.2log%E4%BB%A55%E4%B8%BA%E5%BA%9510%2Blog%E4%BB%A55%E4%B8%BA%E5%BA%950.25+2.%E5%B7%B2%E7%9F%A5lg2%3D0.3010%2Clg3%3D0.4771%2C%E6%B1%82lg%E6%A0%B9%E5%8F%B7%E4%B8%8B45+3.%E3%80%90%EF%BC%881-log%E4%BB%A56%E4%B8%BA%E5%BA%953%EF%BC%89%26%23178%3B%2Blog%E4%BB%A56%E4%B8%BA%E5%BA%952%2Alog%E4%BB%A56%E4%B8%BA%E5%BA%9518%E3%80%91%2Alog%E4%BB%A54%E4%B8%BA%E5%BA%956)
计算1.2log以5为底10+log以5为底0.25 2.已知lg2=0.3010,lg3=0.4771,求lg根号下45 3.【(1-log以6为底3)²+log以6为底2*log以6为底18】*log以4为底6
计算1.2log以5为底10+log以5为底0.25 2.已知lg2=0.3010,lg3=0.4771,求lg根号下45 3.【(1-log以6为底3)²+log以6为底2*log以6为底18】*log以4为底6
计算1.2log以5为底10+log以5为底0.25 2.已知lg2=0.3010,lg3=0.4771,求lg根号下45 3.【(1-log以6为底3)²+log以6为底2*log以6为底18】*log以4为底6
1.2log以5为底10+log以5为底0.25
=2log以5为底10+2log以5为底0.5
=2log以5为底10×0.5
=2log以5为底5
=2
2.已知lg2=0.3010,lg3=0.4771,
lg根号下45
=lg3+1/2lg5
=lg3+1/2(1-lg2)
=0.4771+1/2×(1-0.3010)
=0.4771+0.3345
=0.8116
3.【(1-log以6为底3)²+log以6为底2*log以6为底18】*log以4为底6
=【log²以6为底2+log以6为底2*(2-log以6为底2)】*log以4为底6
=【log²以6为底2+log以6为底2+log²以6为底2】*log以4为底6
=log以6为底2*log以4为底6
=lg2/lg6*lg6/lg4
=lg2/lg6*lg6/(2lg2)
=1/2
1. 2log以5为底10+log以5为底0.25
=2log以5为底10+2log以5为底0.5
=2log以5为底10×0.5
=2log以5为底5
=2
2. 已知lg2=0.3010,lg3=0.4771,
lg根号下45
=lg3+1/2lg5
=lg3+1/2(1-lg2)
=0.4771+1/2×(1-0....
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1. 2log以5为底10+log以5为底0.25
=2log以5为底10+2log以5为底0.5
=2log以5为底10×0.5
=2log以5为底5
=2
2. 已知lg2=0.3010,lg3=0.4771,
lg根号下45
=lg3+1/2lg5
=lg3+1/2(1-lg2)
=0.4771+1/2×(1-0.3010)
=0.4771+0.3345
=0.8116
3. 【(1-log以6为底3)²+log以6为底2*log以6为底18】*log以4为底6
=【log²以6为底2+log以6为底2*(2-log以6为底2)】*log以4为底6
=【log²以6为底2+log以6为底2+log²以6为底2】*log以4为底6
=log以6为底2*log以4为底6
=lg2/lg6*lg6/lg4
=lg2/lg6*lg6/(2lg2)
=1/2
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