12,6 км - 100\%
15,75 - х\%
стало = 15.75*100:12.6=125\%
возросло = 125-100=25\%
1)log(3)2>log(3)1⇒log(3)2>0
2)log(1/3)3=-1 -1<0⇒log(1/3)3<0
3)log(5)1/3<log(5)1⇒log(5)1/3<0
4)log(1/3)1/2>log(1/3)1⇒log(1/3)1/2>0
3 1/12 : х = 5 4/7 : 18/37
37/12 : х = 37/7 : 18/37
37/7 · х = 37/12 · 18/37
37/7 · х = 3/2
х = 3/2 : 37/7
х = 3/2 · 7/37
х = 21/74.
Ответ : х = 21/74.
(6+7)*4=6*4+7*4
(36+18)/9=36/9+18/9