Question

Aflati valoarea nescunocutei :6-5:[4-3:(2-2:a)]=1 ;[(5xa+178)x15+90]:45=63 ; 1+{2x[3+(x--4)x5]:6}x7=8

Answer 1

6-5:[4-3:(2-2:a)]=1
5:[4-3:(2-2:a)] = 6-1
5:[4-3:(2-2:a)] = 5
4-3:(2-2:a) = 5:5
4-3:(2-2:a) = 1
3:(2-2:a) =4-1
3:(2-2:a) = 3
2-2:a = 3:3
2-2:a = 1
2:a = 2-1
2:a = 1
a = 2:1
a = 2


[(5xa+178)x15+90]:45=63
(5xa+178)x15+90=63×45
(5xa+178)x15+90 = 2 835
(5xa+178)x15 = 2 835 -90
(5xa+178)x15 = 2 745
5xa+178 = 2 745 : 15
5×a+178 = 183
5×a = 183-178
5×a = 5
a = 5:5
a = 1


1+{2×[3+(X-4)x5]:6}x7=8
{2×[3+(X-4)x5]:6}x7 = 8-1
{2×[3+(X-4)x5]:6}x7 = 7
{2×[3+(X-4)x5]:6} = 7:7
2×[3+(X-4)x5]:6 = 1
2×[3+(X-4)×5] = 1×6
2×[3+(X-4)×5] = 6
3+(X-4)×5 = 6:2
3+(X-4)×5 = 3
(X-4)×5 = 3-3
(X-4)×5 = 0
X-4 = 0
X = 4

Sper ca te-am ajutat!