Х^2 + px - 39 = 0
x = 13
13^2 + 13p - 39 = 0
169 + 13p - 39 = 0
13p = 169 - 39
13p = 130
p = 10
Одна доля х
Р=2*(10х+4х)
2*14х=56
28ч=56
ч=2
длина 10*2=20 см
ширигна 4*2=8см
А)5 5/6+2 5/6 = 7 10\6 = 8 4\6 = 8 2\3
б)1 8/9+1 4/9 = 2 12\9 = 3 3\9 = 3 1\3
<span>в)5 13/14+2 11/14 = 7 24\14 = 8 10\14 = 8 5\7</span>
37+7*7 = 37 + 49 = 86
(43-7):4 = 36:4 = 9
5*7+15 = 35 + 15 = 50
28-12+8 = 16 + 8 = 24
76 -
?
162*4=648
198+231=429
429:3=143
143+648=791