РЕШИТЕ УРАВНЕНИЯ х = - 21;
2. 20х = -5;
3. 8х + 5 = 0;
4. 3х – 7 = 2;
5. 11 – 4х = 2х;
6. 8х – 2 = 7 + 2х;
7. 3х + (4 – 6х) = 18;
8. 6х – (2х + 5) = - 4;
9. 6 – 2(3х – 9) = - 4х;
10. 5 (2х +2) – 5х = 13;
11. (х – 9)(х+13) = 0;
12. (4х+3)(2х–1) = 0.

3/5 + 13/45 = 27/45 + 13/45 = 40/45 = 8/9
Общий знаменатель 45
45 : 5 = 9 - доп.множ. к 3/5 = (3*9)/(5*9) = 27/45
40/45 = 8/9 - сократили на 5

9/16 + 11/24 = 27/48 + 22/48 = 49/48 = 1 целая 1/48
Общий знаменатель 48
48 : 16 = 3 - доп.множ. к 9/16 = (9*3)/(16*3) = 27/48
48 : 24 = 2 - доп.множ. к 11/24 = (11*2)/(24*2) = 22/48

9/10 + 15/14 = 63/70 + 75/70 = 138/70 = 1 целая 68/70 = 1 целая 34/35
Общий знаменатель 70
70 : 10 = 7 - доп.множ. к 9/10 = (9*7)/(10*7) = 63/70
70 : 14 = 5 - доп.множ. к 15/14 = (15*5)/(14*5) = 75/70
68/70 = 34/35 - сократили на 2

7/48 + 77/96 = 14/96 + 77/96 = 91/96
Общий знаменатель 96
96 : 48 = 2 - доп.множ. к 7/48 = (7*2)/(48*2) = 14/96

1/2; 5/6; 1/10; 2/5; 4/5; 3/8; 3/4;1/12;2/13;

1/7; 4/7; 2/13; 1/3; 4/5; 12/17; 2/3; 2/3;1/6;

3/8; 2/9; 4/5; 3/8; 4/7; 1/5; 2/3; 4/9;5/72;

1/11; 2/3; 2/3; 5/11; 2/3; 3/20; 1; 1/5; 2/11

Пошаговое объяснение:

6/12=1/2 (:6); 35/42=5/6 (:7); 6/60=1/10 (:6); 22/55=2/5 (:11); 8/10=4/5 (:2); 150/400=3/8 (:50); 12/16=3/4 (:4); 12/144=1/12 (:12); 58/377=2/13 (:29);

7/49=1/7 (:7); 16/28=4/7 (:4); 14/91=2/13 (:7); 18/54=1/3 (:18); 52/65=4/5 (:13); 600/850=12/17 (:50); 20/30=2/3 (:10);

144/216=2/3 (:72); 57/342=1/6 (:57);

36/96=3/8 (:12); 18/81=2/9(:9);24/30=4/5

(:6); 9/24=3/8 (:3); 8/14=4/7 (:2); 23/115=1/5 (:23); 50/75=2/3 (:25); 56/126=4/9 (:14); 115/1656=5/72 (:23);

5/55=1/11 (:5); 32/48=2/3 (:16); 10/15=2/3

(:5); 10/22=5/11 (:2); 20/30=2/3 (:10);

126/840=3/20 (:42); 4/4=1 (:4); 78/390=1/5 (:78); 88/484=2/11 (:44).