Q=1/(3)^2
b1=3^3
bn=b1*q^(n-1)
b7=3^3*(3^-2)^6=3^3*3^-12=3^-9=1/3^9
А) 15x-5-8x-10=-24+16x
7x-15=-24+16x
7x-16x=-24+15
-9x=-9
x=1
б) 0,6-1,5+1,5z-z=0,6
1,5z-z=0,6-0,6+1,5
0,5z=1,5
z=3
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
1)<span>y=sin x-1/2x. Y=2/x2+4 ; y=4x+8/2x +3 на (-2;3)</span>