December 2019 1 20 Report
1*) Resolva os sistemas :

x + y = 9
x - y = 3


2 x + 3 y = 12
4 x - 5 y = 2


5 x - 2 y = 8
3 x + 3 y = 3


x - y = 3
x + 2 y = 45
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