2lg2/5+lg5/6-lg4/3=?怎么算的

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2lg2/5+lg5/6-lg4/3=?怎么算的2lg2/5+lg5/6-lg4/3=?怎么算的2lg2/5+lg5/6-lg4/3=?怎么算的2lg2/5+lg5/6-lg4/3=2(lg2-lg5

2lg2/5+lg5/6-lg4/3=?怎么算的
2lg2/5+lg5/6-lg4/3=?怎么算的

2lg2/5+lg5/6-lg4/3=?怎么算的
2lg2/5+lg5/6-lg4/3
=2(lg2-lg5)+(lg5-lg6)-(lg4-lg3)
=2lg2-2lg5+lg5-(lg2x3)-2lg2+lg3
=-lg5-lg2-lg3+lg3
=-(lg5+lg2)
=-lg5x2
=-lg10
=-1

2lg2/5+lg5/6-lg4/3
=lg2/5*2/5*5/6-lg4/3
=lg2/15-lg4/3
=lg(2/15÷4/3)
=lg1/10
=lg10^-1
=-1