(7х - 24) : 12 + 26 = 31
<span>(7х - 24) : 12 = 31 - 26
(7х - 24) : 12 = 5
7x - 24 = 12 * 5
7x - 24 = 60
7x = 60 + 24
7x = 84
x = 84 :7
<span>x = 12
проверка </span></span>(7* 12 - 24) : 12 + 26 = (84 - 24) : 12 + 26 = 60: 12 +26 = 5 + 26 = 31... 31 = 31
<span>Y+80=70×6
Y+80=420
Y=420-80
Y=340</span>
1) х=52
2) х=70
3) х=40
4) х=80
1)4 2/3-2/3=4
2)9 5/9-5/9=9
3)25 21/31-21/31=25
4)75 41/69-41/69=75
5)40 5/106-11 5/106= 29
6)8 3/7-2 2/7= 6 1/7
7)20 11/13-9 2/13= 11 9/13
8)10 5/17-4 3/17= 6 2/17
9)19 20/29-1 17/29= 18 3/29
1*5/6*4/6*3/6*2/6*1/6=120/6*6*6*6*6*6=10/1296