Ответ:
Объяснение:
x²-5x+4=0
x1+x2=5
x²-8x-9=0
x3+x4= 8
x1+x2+x3+x4= 5+8= 13
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Ответ:
Объяснение:
x²-5x+4=0
x1+x2=5
x²-8x-9=0
x3+x4= 8
x1+x2+x3+x4= 5+8= 13