Chuyen de phuong trinh vo ty( suu tam)

... −Giải: Nhận xét : đặt 1t x= −, pttt: 4 1 3 2 1x x t t x+ = + + + (1)Ta rt 21x t= − thay vo thì được pt: ( ) ( )23 2 1 4 1 1 0t x t x− + + + + − =Nhưng không có sự may mắn để giải được...

... −Giải: Nhận xét : đặt 1t x= −, pttt: 4 1 3 2 1x x t t x+ = + + + (1)Ta rt 21x t= − thay vo thì được pt: ( ) ( )23 2 1 4 1 1 0t x t x− + + + + − =Nhưng không có sự may mắn để giải được...

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