September 2018 1 17 Report

rozwiaz uklady rownan

c) 12p - 7r = -16

p-3r=-69

d) 11k + 17l = 45

13k +l = 15

e) 8a+9b=36

a-16b = 210

f) 6a-21b=228

a-12b=21


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