1.(lg5)2次方+lg2*lg50
(lg5)²+lg2*lg50
=(lg5)²+lg2x(lg5*5*2)
=(lg5)²+lg2x(lg5+lg5+lg2)
=(lg5)²+2lg2lg5+(lg2)²
=(lg5+lg2)²
=(lg10)²
=1²
=1
1.(lg5)2次方+lg2*lg50
(lg5)²+lg2*lg50
=(lg5)²+lg2x(lg5*5*2)
=(lg5)²+lg2x(lg5+lg5+lg2)
=(lg5)²+2lg2lg5+(lg2)²
=(lg5+lg2)²
=(lg10)²
=1²
=1