Question

9 + 3 x [6 – 2 x (12 – a x 5)] = 15.

Answer 1

Răspuns:

9 + 3 x [6 – 2 x (12 – a x 5)] = 15

3 x [6 – 2 x (12 – a x 5)] = 15 - 9

3 x [6 – 2 x (12 – a x 5)] = 6

6 – 2 x (12 – a x 5) = 6 : 2

6 – 2 x (12 – a x 5) = 3

2 x (12 – a x 5) = 6 - 3

2 x (12 – a x 5) = 3

12 - a x 5 = 3 : 2

12 - a x 5 = 1,5

a x 5 = 12 - 1,5

a x 5 = 10,5

a = 10,5 : 5

a = 2,1

Answer 2

9+3x6 - 2x (12 - ax 5)] = 15
3x6 - 2x (12 - ax 5)1 = 15 - 9
3x [6-2x (12-ax 5)] =6
6-2x (12-ax 5) =6:2
6-2x (12-ax 5) =3
2x (12-ax 5) = 6-3
2x (12-ax 5) = 3
12 - ax 5=3:2
12 - ax 5 = 1,5
ax 5 = 12 - 1,5
ax 5 = 10,5
a= 10,5:5
a= 2.1