<span>а)3 1/9-(3.5+2 1/9) = </span><span>-2 1/2
3,5 + 2 1/9= 3 5/10 + 2 1/9 = 5 + (5/10+1/9) = 5 +(1/2+1/9)= 5 + (9/18+2/18)= 5 11/18
3 1/9 - 5 11/18 = 3 2/18 - 5 11/18= -2 9/18= -2 1/2
б)1 5/14-(1 2/7-2 9/14)</span> = <span>2 5/7</span>
<span>1 2/7-2 9/14 = 1 4/14 - 2 9/14 = - 1 5/14
1 5/14 - (-1 5/14) = 1 5/14 + 1 5/14 = 2 10/14= 2 5/7
</span>
2² × 7² × 3² × 5³ = 2×2×7×7×3×3×5×5×5=4 × 49 × 9 × 125= 220 500
Х/у=4 2/5; 4 2/5=22/5;
у/х=5/22.
1Незнайка
2Шпунтик
3Винтик
4Знайка
5Сиропчик
6Пончик
2,5,7,8,
0,05 см, 9 мм, 1 год