1.выполнить сложение неравенств 3x + y < 2x + 1 и 3y - 2x < 14 - 2a 2.выполнить умножение неравенств a) 6 1/4 < 9 2/3 и 4< 6 б) x - 2 > 1 и x + 2 > 4

1)3x+y< 2x+1   3y-2x< 14-2a     3y+x< 2x-2a+15 2)а)  61/4< 92/3         4< 6         64< 184     б)  x-2> 1         x+2> 4           x²-4> 4

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:

1).  { ab = 420           { a² + b² = 29²           { a = 420/b       { (420/b)² + b² = 841         176400 + b⁴ = 841b²           b² = x         x² - 841x + 176400 = 0       d = b²-4ac = 707281 - 705600 = 1681 = 41²         x₁ = (-b+√d)/2a = (841+41): 2 = 441         x₂ = (-b -√d)/2a = (841- 41): 2 = 400           b₁ = √x₁ = √441 = 21 (см)         a₁ = 420/b₁ = 20 (см)           b₂ = √x₂ = √400 = 20 (см)           a₂ = 420/b₂ = 21 (см) периметр прямоугольника: p = 2*(a + b) = 2*41 = 82 (см) ответ: 82 см 2). примем за х количество дней, которое по плану должен был затратить на выполнение токарь. за у - количество деталей . тогда:       { 24x = y         { (24+15)(x - 6) = y + 21           39x - 234 = 24x + 21             15x = 255                     x = 17 (дн.) - время выполнения по плану.           24х + 21 = 24*17 + 21 = 429 (дет.) - всего изготовил токарь. ответ: 429 деталей.