Ответ:
{х2+с2=16
х=4 ,с=4
4×2+4×2=16
8+8=16
16=16
х=-4, с=-4
-4×2+(-4)×2=16
-8+(-8)≠16
-16≠16
х=0, с=4
0×2+4×2=16
0+8≠16
8≠16
х=4, с=0
4×2+0×2=16
8+0≠16
8≠16
с-2х=4
х=4, с=4
4-2×4=4
2×4≠4
8≠4
х=-4, с=-4
-4-2×(-4)=4
-12≠4
х=0, с=4
0-2×4=4
-8≠4
х=4, с=0
4-2×0=4
4=4
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