Resolva os seguintes sistemas usando números reais:
a)2x+y=5
x²-y²=8
b)2x-y=3
5x+y²=1
c)x-2y=6
XY=8
a)2x+y=5
x²-y²=8
b)2x-y=3
5x+y²=1
c)x-2y=6
XY=8
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