Question

1. 4/5=x/3

3(x-2)-0,5(x-10)=-6

3/4x- 5x+13/8=1/4+2x

Answer 1

4/5=x/3 /*15

12=5x

-5x=-12 :/(-5)

x=2¹₄

 

3(x-2)-0,5(x-10)=-6

3x-6-0,5x-5=-6

3x-0,5x=-6+6+5

3,5x=5 /*10

35x=50 /:35

x=1,42

 

3/4-5x+13/8=1/4+2x /*4

3-20x+26=1+8x

-20x-8x=1-26-3

-28x=-28 /(-28)

x=1

 

 

Answer 2

4/5=x/3  I *15

15 * 4/5 = 15 * x/3

3 * 4 = 5x

12 = 5x

-5x = -12  I : -5

x = 2,4

 

 

3(x-2)-0,5(x-10)=-6

3x-6-0,5x+5=-5

3x-0,5x=-5+6-5

2,5x=-4  I:2,5

x=1,6

 

3/4x-5x+13/8=1/4+2x  I*8

8*3/4x-8*5x+8*12/8=8*1/4+8*2x

6x-40x+12=2+16x

-34x-16x=2-12

-50x=-10  I:-50

x=0,2