1) 2 4/7-1 1/12=18/7-13/12=216/84-91/84=125/84
2) 3 3/4:125/84=15/4*84/125=63/25=2 13/25
Ответ:
6,56364808
Объяснение:
1) 7,061:2,3-2,2=0,87
2)4,2+17,391:5,2=7,54442308
3)7,54442308*0.87=6,56364808
<span>(1-cos a) (1+cos a)
=1-</span><span>cos² a=sin²a</span>
Вложение ---------------------------
Xn = x1 + (n-1)*d
n = ?
(xn-x1 +d) = n*d
(xn-x1+d)/d = n
n = (-2.6 - 8.2 - 0.3) / (-0.3) = 37