1
12-4x-11-14x+35=0
18x=36
x=2
2
3,6y-18-1,5y+2-4,4=0
2,1y=-20,4
y=-9 5/7
7 8/15 : 113 = (105+8)/15 × 1/113 = 113/15 × 1/113 = 1/15
.....................................
24⁴=(8·3)⁴-(3²)⁵=(8)⁴·3⁴ - 3¹⁰=3⁴·(8⁴-3⁶)=3⁴·(64²-27²)=
=3⁴·(64-27)(64+27)=81·37·91=81·37·7·13
не кратно 8.
кратно 7; 9; 13; 27; 37; 39; 63 и т.д. но не кратно 8