1)3,247т
0,298т
0,093т
6,265т
2) 6, 44 ,,,, 6,45.,,,,,,6,46
3)2,83......2,85.....2,87
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
<span>а) ах=а + 6
x = (a+6)/a = 1 + 6/a
б) с(с-2)х=c^2 -4</span>
x = (c^2-4)/c(c-2)
x = (c+2)/c
При с не равном 2
<span> Cos1890° = Cos(360</span>°<span> * 5 +90</span>°<span>) = Cos90 </span>°<span>= 0 </span>