Решите уравнения (срочно) 1) 5 11/14x - 8/15 = 5/21 2) 7 3/10+25/28x=8 13/35 3)2 1/3:x-1...

Question

Решите уравнения (срочно)
1) 5 11/14x - 8/15 = 5/21
2) 7 3/10+25/28x=8 13/35
3)2 1/3:x-1 1/6=1 5/9
4)2 1/3:(x-1 1/6)=1 5/9

Answer 1

5 11/14x-8/15=5/21

5 11/14x=5/21+8/15     =(25+56)/105=81/105

5 11/14x=81/105

x=81/105:5 11/14          =81/105:81/14=81/105*14/81=2/15

x=2/15

7 3/10+25/58x=8 13/35

25/28x=8 13/35-7 3/10            = 293/35-73/10=(586-511)/70=75/70=15/14

25/28x=15/14

x=15/14:25/28                           = 15/14*28/25=6/5

x=6/5

x=1  1/5

2 1/3:x-1 1/6=1 5/9

2 1/3:x=1 5/6+1 1/6                 = 14/9+7/6=(28+21)/18=49/18

2 1/3:x=49/18

x=2 1/3:49/18                            =7/3*18/49=6/7

x=6/7

2 1/3:(x-1 1/6)=1 5/9

x-1 1/6=2 1/3:1 5/9                    = 7/3:14/9=7/9*9/14=3/2

x-1 1/6=3/2

x=3/2+1 1/6                               = 3/2+7/3=(9+7)/6=16/6=2  4/6=2  2/3

x=2  2/3