<span><em>а) 1\8+1\10+1\4= 5/40 + 4/40 + 10/40 = 19/40 </em>
<em>б) 1\6+1\10+1\15= 5/30 + 3/30 + 2/30 = 10/30 = 1/3</em>
<em>в)3\20+1\5+1\6= 9/60 + 12/60 + 10/60 = 31/60</em>
<em>г)3\7+1\6+5\14= 18/42 + 7/42 + 15/42= 40/42 = 20/21</em>
<em>д)3\4+4\25+7\20= 75/100 + 16/100 + 35/100 = 126/100 = 1 26/100 = 1 13/50 </em>
<em>е)1\2+1\3+1\9= 9/18 + 6/18 + 2/18 = 17/18</em></span>
38 * 19/6 =сокращаем на 2 = 19 * 19/3= 361/3 = 120, 1/3.
Сократим дроби
7*7
49/63 = -------- = 7/9
7*9
17*2
34/85 = ----------- = 2/5
17*5
2/5 не равно 7/9
2960кг = 2т 960 кг = 2,96т