Question

Urgent! Ex 16.Imi trebuie pana la 9:30!

Answer 1

Raspuns:

Explicație pas cu pas:

a)7×x-8=13

7x-8=13

7x=13+8

7x=21

x=3

b)3/4-5/6×x=1/4

3/4-5/6x=1/4

9-10x=3

-10x=3-9

-10x=-6

x=3/5

c)2/5×x-1/2=1/10

2/5x-1/2=1/10

4x-5=1

4x=1+5

4x=6

x=3/2

d)1/8+1/2×(2x-1)=2x-1/8×(8x-1)-1/4×(4x-2)

1/8+x-1/2=2x-1/8×(8x-1)-1/4×(4x-2)

1/8+x-1/2=2x-x+1/8-1/2×(2x-1)

1/8+x-1/2=2x-x+1/8-x+1/2

x-1/2=2x-x-x+1/2

x-1/2=0+1/2

x-1/2=1/2

2x-1=1

2x=1+1

2x=2

x=1

Answer 2

a) 7×x-8=13

7x=13+8

7x=21

x=21:7

x=3

b) 3/4-5/6×x=1/4

9-10x=3

-10x=3-9

-10x=-6

x=3/5

x=0,6

c)2/5×x-1/2=1/10

4x-5=1

4x=1+5

4x=6

x=3/2

x=1,5

d)1/8+1/2×(2x-1)=2x-1/8×(8x-1)-1/4×(4x-2)

1/8+x-1/2=2x-x+1/8-1/4×2(2x-1)

1/8+x-1/2=2x-x+1/8-1/2×(2x-1)

1/8+x-1/2=2x-x+1/8-x+1/2

x-1/2=2x-x-x+1/2

x-1/2=0+1/2

x-1/2=1/2

2x-1=1

2x=1+1

2x=2

x=2:2

x=1