log(3) 10 > 0
lg 3 > 0
log(a) b = 1/ log(b) a
log3 10 + 4 lg3 > 4
1/ lg3 + 4 lg3 > 4
1/ lg3 + 4 lg3 - 4 > 0 | * lg 3
(1 + 4lg² 3 - 4lg 3)/lg 3 > 0
(1 - 2lg 3)²/lg 3 > 0
числитель квадрат > 0 ( 1 ≠ 2lg 3)
знаменатель > 0
доказано
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log(3) 10 > 0
lg 3 > 0
log(a) b = 1/ log(b) a
log3 10 + 4 lg3 > 4
1/ lg3 + 4 lg3 > 4
1/ lg3 + 4 lg3 - 4 > 0 | * lg 3
(1 + 4lg² 3 - 4lg 3)/lg 3 > 0
(1 - 2lg 3)²/lg 3 > 0
числитель квадрат > 0 ( 1 ≠ 2lg 3)
знаменатель > 0
доказано