X-5/x+1=-1⇒x-5/x+2=0
(x²+2x-5)/x=0, x≠0
x²+2x-5=0
D=24,√D=2√6
x=(-2-2√6)/2=-1-√6
x=(-2+2√6)/2=-1+√6
1234:10=123,4. Остаток 4.
A1=-5.6;a2=-4.8;⇒
d=a2-a1=-4.8-(-5.6)=0.8;
an=a1+(n-1)d;⇒n-1=(an-a1)/d ;
n=(an-a1)/d +1;
an=16;
n=[16-(-5.6)]/0.8 +1=21.6/0.8 +1=27+1=28;
a28=16
По формуле a² + 2 * a * b + b² = ( a + b)²
9m² + 6mn + n² = (3m)² + 2*(3m)*n + n² = (3m + n)²