По теореме Виета
х1+х2=9
х1×х2=20
Тогда х1=5, х2=4, х1-х2=5-4=1
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По теореме Виета
х1+х2=9
х1×х2=20
Тогда х1=5, х2=4, х1-х2=5-4=1