-7(4,2х-5)+18-х=5.2-29,4х+35+18-х=5,2
-29,4+35+18-5,2=4х+х
18,4=5х
х=3,68
1) 45/3=15 см - ширина параллелепипеда
2) 15+2=17см - высота параллелепипеда
3) 45*15*17=<u>11475 см3 - объем параллелепипеда </u>
1) 30*36 = 1080 кг
2) 20*42= 840 кг
3) 1080+840=1920 кг
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