Question

2×{3×[4×5×a+1)-3]-2}=2va rog aratatimi cum se rezolva​

Answer 1

Răspuns:  a = 0

Explicație pas cu pas:

2 × { 3 × [ 4 × ( 5 × a + 1 ) - 3 ] - 2 } = 2

3 × [ 4 × ( 5 × a + 1 ) - 3 ] - 2 = 2 : 2

3 × [ 4 × ( 5 × a + 1 ) - 3 ] - 2 = 1

3 × [ 4 × ( 5 × a + 1 ) - 3 ] = 1 + 2 =3

4 × ( 5 × a + 1 ) - 3 = 3 : 3

4 × ( 5 × a + 1 )  = 1 + 3 = 4

5 × a + 1 = 4 : 4

5 × a = 1 - 1

5 × a = 0

a = 0 : 5

a = 0 → numarul, aflat prin metoda mersului invers

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Verific:

2 × { 3 × [ 4 × ( 5 × 0 + 1 ) - 3 ] - 2 } = 2

= 2 × [ 3 × ( 4 × 1  - 3 ) - 2 ] =

= 2 × ( 3 × 1 - 2 ) =

= 2 × 1 =

= 2