A)
1) 126/14=9 (дм) - ширина.
б)
P=9+9+14+14=46(дм)- периметр.
Ответ: 9 дм; 46 дм.
49÷5=8(ост.9) 8×5+9=49
19÷3=6(ост.1) 3×6+1=19
РЕШЕНИЕ
ж) (а + 1/а)² = (а² + 2*а*(1/а) + (1/а)² = а² + 2 + 1/а² - ОТВЕТ
з) ((2-х) - 1/(2х))² = (2-x)² - (2-x)/x + 1/(4x²) = 4 - 4*x +x² - 2/x +1 + 1/(4x²) =
= x² - 4*x - 2/x + 1/(4*x²)
6/24=1/4
16/40=2/5
20/8=5/2
165/1320=33/264=11/88=1/8
72/180=8/20=2/5
300/360=5/6
F(x) =sin²x ; x₁ =π/3 .
f '(x) =(sin²x ) ' =2sinx*(sinx) ' = 2sinx*cosx <em>=</em> sin2x .
f '(π/3) =sin2*π/3 =sin2π/3 =sin(π -π/3) =sinπ/3 = (√3)/2.