А
а1=3,a2=7
d=a2-a1=7-3=4
a23=a1+22d=3+22*4=3+88=91
б
a1=-5,a2=-1
d=a2-a1=-1+5=4
a23=a1+22d=-5+22*4=-5+88=83
<em>2ˣ(2-⁵+2-³)=80</em>
<em>2ˣ=80:(1/32+1/8)</em>
<em>2ˣ=80:(5/32)</em>
<em>2ˣ=80*32/5</em>
<em>2ˣ=16*32</em>
<em>2ˣ=2⁴*2⁵</em>
<em>2ˣ=2⁹⇒</em><em>х=9</em>
1)y=-5x+4
x=-5y+4; 5y=-x+4; y=-1/5x+4/5
2)y=3x-1/2
<span>x=3y-1/2; </span>3y=x+1/2; y=1/3x+1/6
(X^2-18)-12=x^2-18-12=x^2-6
9х-х³=х(9-х²)=х(3+х)(3-х)