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Neymar24
a fost răspuns

determina pe a din:

{[(3xa+5)x3+5]x3+5}x3+5=281

dau coroana

Răspuns :

Primăvară2017
{[(3xa+5)x3+5]x3+5}x3+5=281

{[(3xa+5)x3+5]x3+5}x3=281-5

{[(3xa+5)x3+5]x3+5}x3=276

[(3xa+5)x3+5]x3+5=276:3

[(3xa+5)x3+5]x3+5=92

[(3xa+5)x3+5]x3=92-5

[(3xa+5)x3+5]x3=87

(3xa+5)x3+5=87:3

(3xa+5)x3+5=29

(3xa+5)x3=29-5

(3xa+5)x3=24

3xa+5=24:3

3xa+5=8

3xa=8-5

3xa=3

a=3:3

a=1
Didi12342

{[(3xa+5)x3+5]x3+5}x3+5=281
{[(3xa+5)x3+5]x3+5}x3 = 281-5
{[(3xa+5)x3+5]x3+5}x3 = 276
[(3xa+5)x3+5]x3+5 = 276:3
[(3xa+5)x3+5]x3+5 = 92
[(3xa+5)x3+5]x3 = 92-5
[(3xa+5)x3+5]x3 = 87
(3xa+5)x3+5 = 87:3
(3xa+5)x3+5 = 29
(3×a+5)×3 = 29-5
(3×a+5)×3 = 24
3×a+5 = 24:3
3×a+5 = 8
3×a = 8-5
3×a = 3
a = 3:3
a = 1








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