Δy=y(x₀+Δx)-y( x₀)=5-2(x₀+Δx) - (5-2x₀)=5-2x₀-2Δx-5+2x₀=-2Δx=-2·0,4=-0,8
Ответ десятичной дроби=1.4
115. 116, 161, 611, 123, 132, 213, 231, 312, 321
118. а) 3/37, 3/73, 7/33, б) 3/3377, 3/3737, 3/3773, 3/7337, 3/7373, 3/7733, 7/3337, 7/3373, 7/3733, 7/7333, 33/377, 33/737, 33/773, 37/337, 37/373,
37/733, 73/337, 73/373, 73/733, 77/333.
119. 1/13, 2/13, 3/13, 4/13, 5/13, 6/13
<span>(a+b/a-2b/a+b)*(a+b)</span>