8.000.000*3=24000000*10&^-5=240
<span>а) с^(3) *с^(22)=с^25
<span> с^(18) : с ^(6)=c^12
<span>(с^(4)) ^(6)=c^24
<span>(3с)^5=243c^5</span></span></span></span>
B1=1/3 q=1/3 bn=1/729
bn=b1*q^n-1
1/3*(1/3)^n-1=(1/3)^n=1/729=(1/3)^6
n=6
(b-8)²-(64-6b)=b²-16b+64+6b-64=b²-10b=b(b-10)
(100x-2(7x-2y))(100x+2(7x-2y)=(86x-4y)(114x-4y),
а можно так:100x^2-4(49x^2-28x+4y^2)=100x^2-(196-112x+16y^2)=
=100x^2-(14x-4y)^2=(100x-14x+4y)(100x+14x-4y)=(86x+4y)(114x-4y)