lg²5+lg2+lg2*lg5?
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![lg²5+lg2+lg2*lg5?](/uploads/image/z/1326214-46-4.jpg?t=lg%26%23178%3B5%2Blg2%2Blg2%2Alg5%3F)
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lg²5+lg2+lg2*lg5?
lg²5+lg2+lg2*lg5?
lg²5+lg2+lg2*lg5?
lg²5+lg2+lg2*lg5
=lg²5+lg2*lg5+lg2
=lg5(lg5+lg2)+lg2
=lg5+lg2
=1
=lg5(lg5+lg2)+lg2=lg5*2=lg10=1