899-760=139 730000:500=1460 440+299=739 70400:44=1600 22*90=1980
760 59800:26=2300 940*60=56400 893-492=401 15000:300=50
----- 26+947=973
139
<span>-3.7*(2.5x-7.6)=-3.66+2.1X</span>
<span>-9.25x+28.12=-3.66+2.1x</span>
<span>-9.25x-2.1x=-3.66-28.12</span>
<span>-11.35x=-31.78</span>
x=-31.78/(-11.35)
x=2.8
Ответ. х=2,8
3 - 2/5 * 3 1/3 = 3 - 2/5 * 10/3 = 3 - 2/1 * 2/3 = 3 - 4/3 = 9/3 - 4/3 = 5/3
- 3 : 5 1/4 - 2 1/2 : 7/8 = - 3 : 21/4 - 5/2 : 7/8 = - 3 * 4/21 - 5/2 * 8/7 =
= - 4/7 - 20/7 = - 24/7 = - 3 3/7
7/8 * 2 2/3 + (- 5/6) : 2 1/7 = 7/8 * 8/3 + (- 5/6) : 15/7 = 7/3 + (- 5/6) * 7/15 =
= 7/3 + (- 7/18) = 7/3 - 7/18 = 42/18 - 7/18 = 35/18
1/5 - ( 1 1/2 - 1 2/7 * 7/18) = 1/5 - (1 1/2 - 9/7 * 7/18) = 1/5 - (1 1/2 - 1/2) = 1/5 - 1 = 1/5 - 5/5 = - 4/5
Решение задачи представлено на фото. Ответ 30