X²-4=0
x²=4
x=-2
x=2
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F ' (x0) = k = tga
k - ?
f ' (x) = (sinx + cosx) ' = cosx - sinx
f ' (pi/2) = cos pi/2 - sin pi/2 = 0 - 1 = - 1
<span>-5х(х-0,4)-3(-1,2-0,5х)=
=-5x</span>²+2x+3.6+1.5x=
=-5x²+3.5x+3.6
2) (4b - 1)(4b + 1) - (4b - 1)² = 16b² - 1 - (16b² - 8b + 1) = 16b² - 1 - 16b² + 8b - 1 = 8b - 2
При b = - 4: 8 * (- 4) - 2 = - 32 - 2 = - 34
3)
3x + 2 (4x - 7) = 8
3x + 8x - 14 = 8
11x = 8 + 14
11x = 22
x = 2
Ответ: 1
4. А1, Б3, В2
Ca +c-c=ca
11,2b-2,8-1=11,2-3,8
m+m^2-m+1=m^2+1
3,9k+11,7-k=2,9k+11,7