(lg5)²+lg2×lg50

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(lg5)²+lg2×lg50
(lg5)²+lg2×lg50

(lg5)²+lg2×lg50
(lg5)²+lg2×(lg5+lg5+lg2)
=(lg5)²+2lg2×lg5+(lg2)^2
=(lg2+lg5)^2=(lg10)^2=1