Question

Determinați numărul a pentru care
2127 ‒ {10 + 2 x [15 ‒ (7 + a )]} x 6 = 2019.

Pls ajutor

Answer 1

Răspuns:

Explicație pas cu pas:

2127 ‒ {10 + 2 x [15 ‒ (7 + a )]} x 6 = 2019

{10 + 2 x [15 ‒ (7 + a )]} x 6 = 2127 - 2019 = 108

10 + 2 x [15 ‒ (7 + a ) = 108 : 6 = 18

2 x [15 ‒ (7 + a )] = 18 - 10 = 8

[15 ‒ (7 + a )] = 8 : 2 = 4

15 ‒ (7 + a )= 4

7 + a = 15 - 4 = 11

a = 11-7 = 4

Answer 2

2127 - ( 10 + 2 × ( 15 - ( 7 + a ))) × 6 = 2019

2127 - ( 10 + 2 × ( 15 - 7 - a )) × 6 = 2019

2127 - ( 10 + 2 × ( 8 - a )) × 6 = 2019

2127 - ( 10 + 16 - 2 × a ) × 6 = 2019

2127 - ( 26 - 2 × a ) × 6 = 2019

2127 - ( 156 - 12 × a ) = 2019

2127 - 156 + 12 × a = 2019

1971 + 12 × a = 2019

12 × a = 2019 - 1971

12 × a = 48

a = 48 : 12

a = 4