Question

Решите уравнения пожалуйста

Answer 1

a)

(5x-9) / 4 +(5x-7)/4 = 1  // *4

[(5x-9)/4 +(5x-7)/4 ]*4 = 1*4

[(5x-9)/4 ]*4  + [(5x-7)/4]*4 = 4

1*(5x-9)  + 1*(5x-7) = 4

5x-9 – 5x-7 =4

10x-16=4

10x=20

X=2

OTBET: 2

b)

2x – (2x-3)/3 = (x-6)/3  // *3

[2x -  (2x-3)/3]*3=(x-6)/3 *3

2x*3 – (2x-3)/3 *3 =x-6

6x-3(2x-3)=x-6

6x-6x+9=x-6

X=9+6

X=15

OTBET:15

c)

[x/7 – (3x-1)/14]=2  // *14

x/7 *14 – (3x-1)/14 *14=2*14

2*x – (3x-1)*1=28

2x-3x+1=28

-x+1=28

X=-27

OTBET: -27

d)

(2x-3)/9 + (x-1)/5=2  // *45

[(2x-3)/9 +(x-1)/5 ]*45=2*45

[2x-3)/9 *45 + (x-1)/5 *45 =90

5*(2x-3) + 9(x-1)=90

10x-15+9x-9=90

19x=90+15+9

19x=114

X=6

OTBET:6