<span>5√3=√(5^2*3)=√75
2а√3а=√((2a)^2*3a)=√(4a^2*3a)= √(12a^3)</span><span>
0.2√10=√0.2^2*10=√0.4</span>
Решение
<span>S</span>₅ <span>= 1/2(a</span>₁ <span>+ a</span>₅<span>)•5 = 1/2(a</span>₁ <span>+ a</span>₁ <span>+ 4d)•5 = (a</span>₁ <span>+ 2d)•5
</span><span>S</span>₆₋₁₀ <span>= 1/2(a</span>₆ <span>+ a</span>₁₀<span>)•5 = 1/2(a</span>₁ <span>+ 5d + a</span>₁ <span>+ 9d)•5 = (a</span>₁ <span>+ 7d)•5
</span><span>Найдём разность этих сумм, она равна 200
</span><span>5(a</span>₁ <span>+ 2d) - 5(a</span>₁ <span>+ 7d) = 200</span><span>a</span>₁ <span>+ 2d - a</span>₁ <span>- 7d = 40
</span><span>- 5d = 40
</span><span>d = - 8
</span><span>Аналогично найдём разность суммы с 1 по 10 и с 11 по 20
</span><span>10•1/2(а</span>₁ <span>+ а</span>₁₀<span>) - 10•1/2(а</span>₁₁ <span>+ а</span>₂₀<span>) =
</span><span>= 5(a</span>₁ <span>+ a</span>₁ <span>+ 9d) - 5(a</span>₁ <span>+ 10d + a</span>₁ <span>+ 19d) = 5(9d - 29d) =
= 5(- 20d) =</span><span> 5(- 20)*(- 8) = 800
</span><span>Ответ: 800</span>
<span>f(x)=sin^2x/x^2-1</span>
смотрим f(-ч)=sin^2 (-x)/(-x)^2-1=sin^x/x^2-1=f(x)
f(-x)=f(x)
четная
7а-b-3a+2b+2b-8a=-4a+3b
-6x+3y-24+8x-20y+8=2x-17y-16
<span>f(x)= x^2+x^3
f'(x)=2x+3x^2</span>
