а) x = 0,13
б) x = -2
в) x = 1 2/3
г) y = -1
д) x = 2
е) y = 4
ж) x = 2/11
з) x = 7
и) x = 13
Пошаговое объяснение:
а) 13 - 100x = 0
-100x = -13
x = -13/-100
x = 0,13
б) 7x - 4 = x - 16
7x - x = 4 - 16
6x = -12
x = -12/6
x = -2
в) 13 - 5x = 8 - 2x
2x - 5x = 8 - 13
-3x = -5
x = -5/-3
x = 5/3
x = 1 2/3
г) 4y + 15 = 6y + 17
4y - 6y = 17 - 15
-2y = 2
y = 2/-2
y = -1
д) 5x + (3x - 7) = 9
5x + 3x - 7 = 9
5x + 3x = 9 + 7
8x = 16
x = 16/8
x = 2
е) 3y - (5 - y) = 11
3y - 5 + y = 11
3y + y = 11 + 5
4y = 16
y = 16/4
y = 4
ж) 13 - (5x + 11) = 6x
13 - 5x - 11 = 6x
-5x - 6x = 11 - 13
-11x = -2
x = -2/-11
x = 2/11
з) (7x + 1) - (6x + 3) = 5
7x + 1 - 6x - 3 = 5
7x - 6x = 5 - 1 + 3
x = 7
и) (5x + 2) - (4x + 7) = 8
5x + 2 - 4x - 7 = 8
5x - 4x = 8 + 7 - 2
x = 13
P=52см
a=1дм4см=14см
b=a-5см
c=b-8см
Найти:
d-?
Решение:
d=P-(a+b+c)
d=52-(14+(14-5)+(14-5+8))=52-(14+9+17)=12см
ответ: d=12см