Question

.a) 3 x {2 × (a-1)-1}=999
b) 14+3-2x {3: (4-a) +5} = 1
c) {14+ (15-m): 6} x2-19=9
d) {(a+260 : 2) × 3+6}×3=2007​

Answer 1

Explicație pas cu pas:

a) 3 × {2 × (a - 1) - 1} = 999

2 × (a - 1) - 1 = 999 : 3

2 × (a - 1) - 1 = 333

2 × (a - 1) = 333 + 1

2 × (a - 1) = 334

a - 1 = 334 : 2

a - 1 = 167

a = 167 + 1

a = 168

b) 14 + 3 - 2 × {3 : (4 - a) + 5} = 1

17 - 2 × {3 : (4 - a) + 5} = 1

17 - 1 = 2 × {3 : (4 - a) + 5}

2 × {3 : (4 - a) + 5} = 16

3 : (4 - a) + 5 = 16 : 2

3 : (4 - a) + 5 = 8

3 : (4 - a) = 8 - 5

3 : (4 - a) = 3

4 - a = 3 : 3

4 - a = 1

a = 4 - 1

a = 3

c) {14 + (15 - m) : 6} × 2 - 19 = 9

{14 + (15 - m) : 6} × 2 = 9 + 19

{14 + (15 - m) : 6} × 2 = 28

{14 + (15 - m) : 6} = 28 : 2

14 + (15 - m) : 6 = 14

(15 - m) : 6 = 14 - 14

(15 - m) : 6 = 0

15 - m = 0 × 6

15 - m = 0

m = 15

d) {(a + 260 : 2) × 3 + 6} × 3 = 2007

(a + 130) × 3 + 6 = 2007 : 3

(a + 130) × 3 + 6 = 669

(a + 130) × 3 = 669 - 6

(a + 130) × 3 = 663

a + 130 = 663 : 3

a + 130 = 221

a = 221 - 130

a = 91