My favourite sport is karate, which is one of the Oriental martial arts. Karate is a popular sport in the world because it improves self-confidence and self-discipline, memory and attention. Besides, karate teaches us self-defence, respect, self-control and patience.
I started practising karate when I was eight. Since that time I have been training twice a week in our local sports centre. The lessons are physically hard but I enjoy them. Our sensei teaches us patiently and inspires us to become better people. I have already participated in a few competitions.
I am glad that I chose karate because it gives me so much: I have become more patient and physically stronger.
Karate is my favorite sport
My favourite sport is karate, which is one of the Oriental martial arts. Karate is a popular sport in the world because it improves self-confidence and self-discipline, memory and attention. Besides, karate teaches us self-defence, respect, self-control and patience.
I started practising karate when I was eight. Since that time I have been training twice a week in our local sports centre. The lessons are physically hard but I enjoy them. Our sensei teaches us patiently and inspires us to become better people. I have already participated in a few competitions.
I am glad that I chose karate because it gives me so much: I have become more patient and physically stronger.
Объяснение:
= 3 984 016
2) a³+a²b+ab²-b³ = a²(a+b)-b²(a+b) = (a+b)(a²-b²) = (a+b)(a-b)(a+b) =
= (a+b)²(a-b)
(a+b)²(a-b) = (11,6 + (-1,6))²(11,6 - (-1,6)) = (11,6-1,6)²(11,6+1,6) =
= 10² * 13,2 = 100 * 13,2 = 1320
ответ: а)
3) х-у=4; ху=12
х = 4+у
у(4+у)=12
4у+у²=12
у²+4у-12=0
D=16+48=64
у₁ = -4-8 / 2 = -6
у₂ = -4+8 / 2 = 2
х₁ = 4+(-6) = 4-6 = -2
х₂ = 4+2 = 6
х²+у² = (-6)²+2² = 36+4 = 40
ответ: а)
4) b - 1/b = 2,5 (возведем в квадрат обе части)
b² - 2 * b * 1/b + 1/b² = 6,25
b² + 1/b² = 6,25-2
b² + 1/b² = 4,25
ответ: б)