B2= bn * q^n-1 = 18 * 1/9 = 2
А) yn=3-2n
y1=1;
y2=-1;
y3=-3;
y4=-5;
y5=-7;
б)yn=2n^2-n
y1=1;
у2=6;
у3=15;
у4=28;
у5=45;
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Что-бы умножить а на б ле