1) 28 : 14/9 = 28 * 9/14 = 2 *9 = 18 см - ширина прямоугольник.
2) 18 * 28 = 504 см² - площадь прямоугольника .
2/5 * 5/2 = сокращаем и будет 1.
3/4 +3/5= 15/20+12/20=27/20= 1 7/20
⁵<span>/</span>₇<span>+3</span>⁶<span>/</span>₇ <span>= 3</span>⁵⁺⁶/₇ = 3¹¹/₇ = 4⁴/₇
<span>
6</span>⁶<span>/</span>₁₃<span>-5</span>¹¹<span>/</span>₁₃<span> = 11</span>⁶⁺¹¹/₁₃ = 11¹⁹/₁₃ = 12⁶/₁₃
<span>
9</span>³<span>/</span>₁₃<span>-8</span>⁹<span>/</span>₁₃ <span>= 17</span>³⁺⁹/₁₃ = 17¹²/₁₃<span>
2</span>¹⁵<span>/</span>₁₉<span>+1</span>¹⁵<span>/</span>₁₉ = 3¹⁵⁺¹⁵/₁₉ = 3³⁰/₁₉ = 4¹¹/₁₉