求值lg5·lg20＋lg²2

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求值lg5·lg20＋lg²2
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求值lg5·lg20＋lg²2
求值lg5·lg20＋lg²2

求值lg5·lg20＋lg²2
lg5lg20+(lg2)²
=lg5(lg5+lg4)+(lg2)²
=(lg5)²+2lg5lg2+(lg2)²
=(lg5+lg2)²
=(lg10)²
=1