(99 - 9х) * 8 + 14 = 86
(99 - 9х) * 8 = 86 - 14
(99 - 9х) * 8 = 72
99 - 9х = 72 : 8
99 - 9х = 9
9х = 99 - 9
9х = 90
х = 90 : 9
х = 10
--------------------------
Проверка: (99 - 9 * 10) * 8 + 14= 86
(99 - 90) * 8 + 14 = 86
9 * 8 + 14 = 86
72 + 14 = 86
86 = 86
4 и 4
3 и 3 и 2
2 и 2 и 2 и 2
1 и 1 и 1 и 1 и 1 и 1 и 1 и 1
6 и 1 и 1
6 и 2
и т. д.
1)
1 3/8 + 2 5/6 = 1 9/24 + 2 20/24 = 3 29/24 = 4 5/24
2)
1/3 - 0,12 = 1/3 - 3/25 = 25/75 - 9/75 = 16/75
3)
1,4 • 2 6/7 - 2 1/7 : 1,25 = 7/5 • 20/7 - 15/7 : 5/4 = 4 - ( 12/7 ) = 3 7/7 - 1 5/7 = 2 2/7
4).
Смотри номер 3)
5)
1/6х + Х = 3
7/6х = 3
Х = 3 : 7/6
Х = 18/7
Х = 2 4/7
6)
0,2( 4х - 2/3х ) - 1/6х = 1/5•10/3х - 1/6х = 2/3х - 1/6х = 4/6х - 1/6х = 3/6х = 1/2х
7)
4 : ( 20 - Х ) = 0,3
20 - Х = 4 : 3/10
20 - Х = 40/3
Х = 19 3/3 - 13 1/3
Х = 6 2/3
1)
d(x^3)/3+d(y^2)/2=0
d(x^3/3+y^2/2)=0
x^3/3+y^2/2=C
2x^3+3y^2=C - это ответ
2)
2xdy=ydx
2dy/y=dx/x
2ln(|y|)=ln(|x|)+C
|y|^2=|x|*C
x=C*y^2
x=1 y=2
1=C*4
C=1/4
x=y^2/4 - это ответ