Question

Sa se determine valoarea lui x din:
•2×[3+5×(2x-1)]=56
•3+7×[45-3×(4x+3)]=3
DAU CORONITA!!!!!

Answer 1

Răspuns:

Explicație pas cu pas:

2 × [ 3 + 5 × ( 2 x - 1 ) ] = 56

3 + 5 × ( 2 x - 1 ) = 56 : 2

3 + 5 × ( 2 x - 1 ) = 28

5 × ( 2 x - 1 ) = 28 - 3

5 × ( 2 x - 1 ) = 25

2 x - 1 = 25 : 5

2 x - 1 = 5

2 x = 5 + 1

x = 6 : 2

x = 3

_______________________

3 + 7 × [ 45 - 3 × ( 4 x + 3 ) ] = 3

7 × [ 45 - 3 × ( 4 x + 3 ) ] = 3 - 3

45 - 3 × ( 4 x + 3 ) = 0 : 7

3 × ( 4 x + 3 ) = 45 - 0

4 x + 3 = 45 : 3

4 x + 3 = 15

4 x = 15 - 3

4 x = 12

x = 12 : 4

x = 3

Answer 2

2 × [ 3 + 5 × ( 2 × X - 1 ) ] = 56

3 + 5 × ( 2 × X - 1 ) = 56 : 2

3 + 5 × ( 2 × X - 1 ) = 28

5 × ( 2 × X - 1 ) = 28 - 3

5 × ( 2 × X - 1 ) = 25

2 × X - 1 = 25 : 5

2 × X - 1 = 5

2 × X = 5 + 1

2 × X = 6

X = 6 : 2

X = 3

3 + 7 × [ 45 - 3 × ( 4 × X + 3 ) ] = 3

7 × [ 45 - 3 × ( 4 × X + 3 ) ] = 3 - 3

7 × [ 45 - 3 × ( 4 × X + 3 ) ] = 0

45 - 3 × ( 4 × X + 3 ) ] = 0 : 7

45 - 3 × ( 4 × X + 3 ) ] = 0

3 × ( 4 × X + 3 ) ] = 45 - 0

3 × ( 4 × X + 3 ) ] = 45

4 × X + 3 = 45 : 3

4 × X + 3 = 15

4 × X = 15 - 3

4 × X = 12

X = 12 : 4

X = 3