а)
4 а - в а - 5 в
+ =
12 а(в 2 ст.) 15 а в(в 2 ст.)
4а-в+а-5в/12 а в2=
5а-в/12ав2
б)
m + 4 m + 6
- =
m m + 2
(m+4)(m+2)-m(m+6)/m(m+2)=
m2+2m+4m+8-m2-6m/m(m+2)=
8/m(m+2)
в)
у + 3 у - 3
- =
4 у (у - 3) 4 у (у + 3)
(у+3)2-(у-3)2/4 у (у + 3)(у - 3)=
(у+3-у+3)(у+3+у+3)/4у(у2-9)=
6(2у+6)/4у(у2-9)=
12(у+3)/4у(у-3)(у+3)=
12/4у(у-3)=
3/у(у-3)
г) 5 - 4 у 4
+ =
у(в 2 ст.) - 6 у у - 6
5-4у+4у/у(у-6)=
5/у(у-6)
4x - 28 = x + 17
3x = 45
x = 15
c - 32 = - 7 * ( c + 8 )
c - 32 = - 7c - 56
8c = - 24
c = - 3
3 * ( 4x - 8 ) = 3x - 6
12x - 24 = 3x - 6
9x = 18
x = 2
5 * ( x - 7 ) = 3 * ( x - 4 )
5x - 35 = 3x - 12
2x = 23
x = 11,5
4 * ( x - 3 ) - 16 = 5 * ( x - 5 )
4x - 12 - 16 = 5x - 25
4x - 28 = 5x - 25
x = - 3
8 * ( 2a - 6 ) = 2 * ( 4a + 3 )
16a - 48 = 8a + 6
8a = 54
a = 6,75
- 4 * ( 3 - 5x ) = 18x - 7
- 12 + 20x = 18x - 7
2x = 5
x = 2,5
6a + ( 3a - 2 ) = 14
6a + 3a - 2 = 14
9a = 16
a = 1 ( 7/9 )
8x - ( 7x - 142 ) = 51
8x - 7x + 142 = 51
x = - 91