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Pomocy !!

Zadanie 5 strona 99 matematyka z plusem . Rozwiąż układ równań :

a) x+3y = 3

x - y = 5

b) 2x - y = 10

x+5y = -17

c) 3m +n = 9

2m - 5n = -11

d) 4a - 2 =b

3a +7b = 1,5

e) 5x = 4 - 2y

4x + y =

f) 6x - 3y = 9

x +5y = - 9,5


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