January 2019 0 22 Report
Rozwiąż układy równań:
a)  \left \{ {{0,2a+b=13} \atop {a+0,2b=17}} \right.

b)  \left \{ {{x=1,3y} \atop {y+5=x-2}} \right.

c)  \left \{ {{1,2x=0,8y} \atop {2x=y+5}} \right.

d)  \left \{ {{x+y=90} \atop {0,9*x+1,1*y=85}} \right.

Najlepiej metodą przeciwnych współczynników. Bardzo proszę o pomoc :)
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