(lg2)²+lg5×lg20+5=?
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![(lg2)²+lg5×lg20+5=?](/uploads/image/z/15232766-14-6.jpg?t=%28lg2%29%26%23178%3B%2Blg5%C3%97lg20%2B5%3D%3F)
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(lg2)²+lg5×lg20+5=?
(lg2)²+lg5×lg20+5=?
(lg2)²+lg5×lg20+5=?
原式=(lg2)^2+lg5xlg(5x4)+5=(lg2)^2+lg5x(lg5+lg4)+5=
(lg2)^2+(lg5)^2+lg5x2lg2+5=(lg2+lg5)^2+5=(lg10)^2+5=1+5=6