Question

2•5²-5•[3²+5-3•(2x-2004°)]=5²

Answer 1

Răspuns

Explicație pas cu pas:

2 × 5² - 5 × [ 3² + 5 - 3 × ( 2 x - 2 004⁰) ] = 5²

2 × 25 - 5 × [ 9 + 5 - 3 × ( 2 x - 1 ) ] = 25

50 - 5 × [ 14 - 3 × ( 2 x - 1 ) ] = 25

5 × [ 14 - 3 × ( 2 x - 1 ) ] = 50 - 25

5 × [14 - 3 × ( 2 x - 1 ) ] =  25

14 - 3 × ( 2 x - 1 ) = 25 : 5

14 - 3 × ( 2 x - 1 ) = 5

3 × ( 2 x - 1 ) = 14 - 5

2 x - 1 = 9 : 3

2 x = 3 + 1

x = 4 : 2

x = 2 → numarul, aflat prin metoda mersului invers