<span><span>n=0 => 2*0-1= -1
n=1 => 2*1-1= 1
n=2 => 2*2-1=3
n=3 => 3*2-1=5
n=4 => 2*4-1=7
n=5=> 2*5-1=9</span></span>
1) 3:6+1/4 · 3 - 1/2 = 1/2 + 3/4 -1/2 = 3/4
2) 3:6 +1/4 · (3 - 1/2) = 1/2+1/4 ·2 1/2 = 1/2 + 1/4 · 5/2 = 1/2+5/8=
= 4/8 + 5/8 = 9/8 = 1 1/8
7:1,4+0,6х3=5+1,8
6,8=6,8
(-9):1,5+4=-6+4
-2=-2
0,8х(-7)+1,2х5=-5,6+6
0,4=0,4
3,2х5+9:6=16+1,5