5x*25,4-1,3*25,4=
=52.07
127x*33.02=52.07
127x=85.09
X=85.09/127
X=0.67
6((-0,2+2)+2)×3-2,4=6×3,8×3-2,4=66
y2 = y1 + d
yn = y1 + (n-1)d
y1 - первый член
d - разница
y3 = y1 + (3-1)d = y1 + 2d
y7 = y1 + (7-1)d = y1 + 6d
y7 - y3 = y1 + 6d - y1 - 2d = 4d
y7 - y3 = -6 - 10 = -16
4d = -16
d = -4
4-|-x|=3
-|-x|=3-4=-1
|-x|=1
x₁=1
x₂=-1
отрицательное решение х=-1