a1=2+3=5
a2=2*2+3=7
d=a2-a1=7-5=2
S50=)(2*5+2(50-1))50)/2=1850
S100=((2*5+2(100-1))100)/2= 12400
4.
x-11\x-6=11\16
16(x-11)=11(x-6)
16x-176=11x-66
16x-11x=-66+176
5x=110
x=22
5.
2-Б 4-А 1-В
<span>а)y=-2x sin x; ( прицепим формулу: (UV)'= U'V + UV')
y' =(</span>-2x)' * sin x - 2x *(sin x)' = -2Sinx + 2xCosx.<span>
б)y = (2x-3x</span>²)/(3x-4); ( Прицепим формулу: (U/V)' = (U'V - UV')/V²<span> )
y' =</span> (2x-3x²)' *(3x-4) - (2x-3x²)(3x-4)' /(3x-4)²=
<span>=((2 -6x)(3x -4) - (2x -3x</span>²)*3)/(3x -4)² = (6x -18x² -8 +24x -6x +9x²)/(3x -4)²=
<span>=(-9x</span>²+24x -8)/(3x -4)²<span>
в) y=2(3x^5-x)^6
y' = 12(3x</span>⁵ -x )⁵ *(3x⁵ -x)' = 12(3x⁵ - x)⁵*(15x⁴ -1)