1) 522 + 723 = 1245
2)932 - 517 = 415
3) 1245 : 415 = 3
4) 57 * 3 = 171
(522 + 723) : ( 932 - 517 ) * 57 = 171
Ответ 171.
<span>(12 1/9 - 10 2/5) : 38 1/2 + 2 8/9 * 18 = </span><span>52 2/45 </span><span>
1. </span>(12 1/9 - 10 2/5) = 109/9 - 52/5 = (109 * 5 - 52 * 9)/45 = (545 - 468)/45 = 77/45
2. 77/45 : 38 1/2 = 77/45 : 77/2 = 77/45 * 2/77 = 2/45
3. 2 8/9 * 18 = 26/9 * 18 = 26 * 2 = 52
4. 2/45 + 52 = 52 2/45
3- 2/5 * 3.1/3=3 - 2/5*10/3=3 - 4/3= 3 - 1.1/3=1. 2/3
-3 : 5. 1/4 - 2. 1/2 : 7/8= - 3/1*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 * 7/15= 7/3 - 7/18 =
42/18 - 7/18= 35/18= 1. 17/18
1/5 - (1.1/2 - 1. 2/7 * 7/18) = 1/5 - (3/2 - 9/7* 7/18)= 1/5 - (3/2-1/2)= 1/5 - 1= - 4/5
Нехай, одна сторона = х, друга - 5х.
P = 2х+10х=48 дм
12х = 48 дм
х = 48÷12=4 дм
Сторона = 4 дм
2 - а сторона = 5*4= 20 дм
S=4*20=80 дм в квадраті
5/7*11/8=55/56
5/7:11/8=40/77
55/56 больше