Răspuns: a = 3
Explicație pas cu pas:
k)
32 - 3 × [ 15 - 2 × ( 16 - 36 : a ) ] - 10 = 1
32 - 3 × [ 15 - 2 × ( 16 - 36 : a ) ] = 1 + 10
32 - 3 × [ 15 - 2 × ( 16 - 36 : a ) ] = 11
3 × [ 15 - 2 × ( 16 - 36 : a ) ] = 32 - 11
3 × [ 15 - 2 × ( 16 - 36 : a ) ] = 21
15 - 2 × ( 16 - 36 : a ) = 21 : 3
15 - 2 × ( 16 - 36 : a ) = 7
2 × ( 16 - 36 : a ) = 15 - 7
2 × ( 16 - 36 : a ) = 8
16 - 36 : a = 8 : 2
16 - 36 : a = 4
36 : a = 16 - 4
36 : a = 12
a = 36 : 12
a = 3 → numarul, aflat prin metoda mersului invers
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Verific:
32 - 3 × [ 15 - 2× ( 16 - 36 : 3 ) ] - 10 = 1
= 32 - 3 × ( 15 - 2 × 4 ) - 10 =
= 32 - 3 × 7 - 10 =
= 32 - 21 - 10 =
= 11 - 10 =
= 1
