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➤ Cerință: Află numerele necunoscute:
➤ Răspuns:
a)
m × m × m × 5 = 4 × 8 + 2 × 4
5 × m³ = 32 + 8
5 × m³ = 40
m³ = 40 : 5
m³ = 8 ⇒ m = 2 ; ( 2³ = 2 × 2 × 2 = 8 )
b)
n : n + 1 + n × n × n = 33 - 3 - 3 : 3
1 + 1 + n³ = 33 - 3 - 1
2 + n³ = 30 - 1
2 + n³ = 29
n³ = 29 - 2
n³ = 27 ⇒ n = 3 ; ( 3³ = 3 × 3 × 3 = 27 )
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