December 2018 1 13 Report
Rozwiąż układy równań (metodą przeciwnych współczynników) :
1. -x+y+7= 2x+3y+9
2x+y+10=-4+3y+30

2. 2x+3y=15
3(x-2) - (4-y) =2

3. -2(x+y) +5 (2x+y) = 12
4 (y-x) +3(x-y) =-7
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