Question

va rog este urgent!!!​

Answer 1

Răspuns:

Explicație pas cu pas:

9) 1,2²-0,5² = 1,44 - 0,25 = 1,19

10)  (am pus n in loc de c)

(2ᵃ)ᵇ· (2ᵇ)ⁿ  = 2ᵃᵇ · 2ᵇⁿ = 2ᵃᵇ⁺ᵇⁿ = 2ᵇ⁽ᵃ⁺ⁿ⁾

a = 2  ; b+n = 2 => i) b = 1 ; n = 1 ; ii) b = 0 ; n = 2 ; iii)  b = 2 ; n = 0

i) a = 2 ; b = 1 ; n = 1

(2ᵃ)ᵇ· (2ᵇ)ⁿ =  2ᵇ⁽ᵃ⁺ⁿ⁾ = 2¹⁽²⁺¹⁾ = 2³ = 8

ii) a = 2 ; b = 0 ; n = 2

(2ᵃ)ᵇ· (2ᵇ)ⁿ =  2ᵇ⁽ᵃ⁺ⁿ⁾ = 2⁰ = 1

iii) a = 2 ; b = 2 ; n = 0

(2ᵃ)ᵇ· (2ᵇ)ⁿ =  2ᵇ⁽ᵃ⁺ⁿ⁾ =2²⁽²⁺⁰⁾ = 2⁴ = 16

11) 2+4+6+....+50 = 2· (1+2+3+....+25) = 2· (1+25)· 25:2 = 26· 25 = 650

12) ma(a,b,c) = 7

ma(a , a+1 , a+2) = 7  = (a+a+1+a+2)/3 =>

a+a+1+a+2 = 21 => 3a = 18 => a = 6 ; a+1 = 7 ; a+2 = 8

(6+7+8)/3 = 21/3 = 7

13) a-b = 18

a:b = 3 rest 2 <=> a = 3b +2  =>

3b+2-b = 18  => 2b = 16  => b = 8  ; a = 26