102:12=8,5га за 1 день
59,5:8,5=7 дней
2х + 4у = -2,
6х - 2у = 6,
х = (-2-4у) : 2,
6*(-2-4у) : 2 - 2у = 6,
-6 - 12у - 2у = 6,
-14у = 6 + 6,
-14у = 12,
у = - 6/7,
х = (-2-4*(-6/7)) : 2 = (-14/7 + 24/7) : 2 = 10/7 * 1/2 = 10/14 = 5/7,
ответ: (5/7; -6/7)
Дробь неправильная, когда знаменатель меньше числителя:
n - 3 < 7
n < 10, n ≠ 3
n = 1; 2; 4; 5; 6; 7; 8; 9
<span>1)1/5×3=1/5*3/1=1*3/5*1=3/5 ili 0.6
</span><span>2)2/11×5=2/11*5/1=2*5/11*1=10/11 ili 0.9
</span><span>3)10×1/31=10/1*1/31=10*1/1*31=10/31 ili 0.3
</span><span>4)5×2/9=5/1*2/9=5*2/1*9=10/9=1.1/9 ili 1.1
</span><span>5)3×3/7=3/1*3/7=3*3/1*7=9/7=1.2/7 ili 1.3</span>
1/2 + (3-2/3)/7 =(7+6-4/3)/14=((39/3)-(4/3))/14=(35·14)/3=490/3