3lg2-3lg5等于多少啊

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3lg2-3lg5等于多少啊
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3lg2-3lg5等于多少啊
3lg2-3lg5等于多少啊

3lg2-3lg5等于多少啊
3lg2-3lg5
=3 lg(2/5)
=3 lg(4/10)
=3 (lg4-lg10)
=3 (lg4-1)
=6lg2-3

6lg2-3

lg8-lg125
=lg8/125
=lg0.064=2lg0.8=2(lg4-lg5)=2(2lg2-lg5)
=2(2*0.3010-0.6990)
=-0.194
错了
3lg2-3lg5
=3 lg(2/5)
=3 lg(4/10)
=3 (lg4-lg10)
=3 (lg4-1)
=6lg2-3=6*0.301-3
=-1.194

原式=lg(2*2*2)-lg(5*5*5)
=lg8-lg125
=lg(8/125)
=lg0.064
=lg(0.1*0.64)
=lg(0.1)+lg0.64
=-1+2lg0.8
=-1+2lg(8/10)
=-1+2(lg8-lg10...

全部展开

原式=lg(2*2*2)-lg(5*5*5)
=lg8-lg125
=lg(8/125)
=lg0.064
=lg(0.1*0.64)
=lg(0.1)+lg0.64
=-1+2lg0.8
=-1+2lg(8/10)
=-1+2(lg8-lg10)
=-1+2(lg8-1)
=-3+2lg8
=-3+2*3lg8
=-3+6lg8
约等于-1.194
好像是这样子的,过程有点繁琐,希望能够帮到你。

收起

3lg2-3lg5=3 lg(2/5)
=3 lg(4/10)
=3 (lg4-lg10)
=3 (lg4-1)
=3 (lg2^2-1)
=6lg2-3