Х2+у2=20 Х2+(2-3Х)2=20 У=2-3Х Х2+4+3Х2=20 4Х2=16
Х2=4
Х=2
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Х2+у2=20 Х2+(2-3Х)2=20
У=2-3Х Х2+4+3Х2=20
4Х2=16
Х2=4
Х=2