Question

3. Afla valoarea lui a din:
a) 2347 + a + 576 = 4122;
a-2346 = 4725;
b) 2x a - 70 = 10;
75: a - 3 = 2.​

Answer 1

a)

• 2347 + a + 576 = 4122

=> 2923 + a = 4122

=> a = 4122 - 2923

=> a = 1199

• a - 2346 = 4725

=> a = 4725 + 2346

=> a = 7071

b)

• 2a - 70 = 10

=> 2a = 10 + 70

=> 2a = 80

=> a = 80 : 2

=> a = 40

• 75 : a - 3 = 2

=> 75 : a = 2 + 3

=> 75 : a = 5

=> a = 75 : 5

=> a = 15

----------ᵈⁱᵃ----------