Question

Vă rog frumos este urgent!
ex:21si22

Answer 1

21)
Larisa = a
Alina = b
a = 5b
a - 60 = x -> 5b - 60 = x / + 60 -> 5b = x + 60
b + 60 = x / - 60 -> b = x - 60 / *5 -> 5b = 5x - 300
Calculele de mai sus sunt amandoua egale cu 5b deci rezulta
x + 60 = 5x - 300 / + 300
x + 360 = 5x / - x
360 = 4x / :4
x = 90
a - 60 = x -> a - 60 = 90 / + 60 -> a = 150
b + 60 = x -> b + 60 = 90 / - 60 -> b = 30
22)
a + b + c = 270
a - x = 24 -> a = x + 24
b - x = 81 -> b = x + 81
c - x = 132 -> c = x + 132
Inlocuim in suma si rezulta.
x + 24 + x + 81 + x + 132 = 270
3x + 237 = 270 / - 235
3x = 33 / :3
x = 11
a = x + 24 = 11 + 24 = 35
b = x + 81 = 11 + 81 = 92
c = x + 132 = 11 + 132 = 143
Verificare:
a + b + c = 35 + 92 + 143 = 270