1/9 - а² = (1/3)² - а² = (1/3 - а) · (1/3 + а)
1*0 =0
2*0=0
85*0=0
999999*0=0
123456789*0=0
К/м=0,75 = 75/100
м/к= 100/75= 1 25/75 = 1 1/3
Математический метод, применяемый для решения различных задач.
1. (0.5+i)+(1-1.5i) = 0.5+i+1-1.5i = 1.5-0.5i
(0.5+i)-(1-1.5i) = 0.5+i-1+1.5i = -0.5+2.5i
(0.5+i)*(1-1.5i) = 0.5-0.75i+i-1.5i² = 0.5-0.75i+i+1.5 = 2+0.25i
2. Z=3+4i
(3;4) - 1 четверть
alpha = beta
tg beta = |b/a| = 4/3
beta = arctg 4/3
alpha = arctg 4/3
r = √(3²+4²) = 5
Z = 5(cos (arctg(4/3))+i sin(arctg(4/3))
3. x²-10x+50=0
D=100-200=-100
x1= (10+√-100)/2 = (10+10i)/2 = 5+5i
x2 = 5-5i