高一数学,第三题,求过程 70
1个回答
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(1)原式=loga(2)+loga[2^(-1)]
=loga(2)-loga(2)
=0
(2)原式=log3(18÷2)
=log3(9)
=log3(3^2)
=2
(3)原式=lg[4^(-1)]-lg25
=-lg4-lg25
=-(lg4+lg25)
=-lg100
=-2
(4)原式=log5(100)+log5(0.25)
=log5(25)
=2
(5)原式=2log5(5^2)-3log2(2^6)
=4-18
=-14
(6)原式=log2[log2(2^4)]
=log2(4)
=2
望采纳
=loga(2)-loga(2)
=0
(2)原式=log3(18÷2)
=log3(9)
=log3(3^2)
=2
(3)原式=lg[4^(-1)]-lg25
=-lg4-lg25
=-(lg4+lg25)
=-lg100
=-2
(4)原式=log5(100)+log5(0.25)
=log5(25)
=2
(5)原式=2log5(5^2)-3log2(2^6)
=4-18
=-14
(6)原式=log2[log2(2^4)]
=log2(4)
=2
望采纳
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