А) =-2,7*0,4=-1,08
б) = 1977/10*10/1=1977
в) = 88/1*10/1=880
Получим
lim x->0 11(x^2 + 25x + 1) =
= 11(0 + 0 + 1) = 11
Ответ
11
1.
a) 1.25^4 x 8^4
=(1.25 x 8)^4
=10^4
b) 6^12/36 x 6^9
=6^3/6^2
=6
2.
a) 21x^3y^2 x (-4/7x)
=-3x^3y^2 x 4x
= -12x^4y^2
b) -0.25a^2b^4 x (-8ba^3)
=-0.25a^2b^4 x (-8a^3b)
=2a^5b^5
3.
a) -3a^8b^3 x 2ab^6
=-6a^8b^3+6a^1
=-6a^8+1b^9
=-6a^9b^9
b) -98xy^3 x (1/7x^2)^2
=-98xy^3 x 1/49x^4
=-2xy^3x^4
=-2x^5y^3
c) (-4ab^3)^3 x (a^2b)^2
=-(4ab^3)^3 x (a^2b)^2
=-64a^3b^9a^4b^2
=-64a^7b^11
4. ?
5.
3 x 3^3 x -1/3^2
=-3 x 3^3 x 3^-2
=-3^2
=-9
-ctg(a+90°)+4ctg(a+270°)-3tg(a+360°) = ? tga=0.65
ctg(a+90°) +4ctg(a+270°)- 3tg(a+360°) = tgα -4tgα - 3tgα = -6tgα = -6*0,65=
<span>= -3,9
</span>