70. Касрро ба намуди сумма ё фарқи касрҳо тасвир кунед: а) \(\frac{2x+y}{x^2}\); б) \(\frac{x^2-4a^2x}{2ax^2}\); в) \(\frac{a^2+ab}{a^2}\); г) \(\frac{x^2-2xy}{x^3}\).

1. \(\frac{2x+y}{x^2}=\frac{2x}{x^2}+\frac{y}{x^2}=\frac{2}{x}+\frac{y}{x^2}\).
2. \(\frac{x^2-4a^2x}{2ax^2}=\frac{x^2}{2ax^2}-\frac{4a^2x}{2ax^2}=\frac{1}{2a}-\frac{2a}{x}\).
3. \(\frac{a^2+ab}{a^2}=\frac{a^2}{a^2}+\frac{ab}{a^2}=1+\frac{b}{a}\).
4. \(\frac{x^2-2xy}{x^3}=\frac{x^2}{x^3}-\frac{2xy}{x^3}=\frac{1}{x}-\frac{2y}{x^2}\).

Ответ: а) \(\frac{2}{x}+\frac{y}{x^2}\); б) \(\frac{1}{2a}-\frac{2a}{x}\); в) \(1+\frac{b}{a}\); г) \(\frac{1}{x}-\frac{2y}{x^2}\).