exercitiile 17, iar la 18 a si b
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17.a) (2xpatrat-3x+10x-15)-2xpatrat-8x+(xpatrat-3x-2x+6)= 2xpatrat -3x +10x-15-2xpatrat-8x+xpatrat-3x-2c+6=xpatrat-6x-9= (x-3)la patrat
b) 3xpatrat-12x+x-4-3xpatrat+12c-xpatrat-4x-3x-12= -xpatrat-6x-16
c) 2xpatrat-5x+8x-20+2xpatrat+2x+3x+3-4xpatrat-8= 8x-25
b) 3xpatrat-12x+x-4-3xpatrat+12c-xpatrat-4x-3x-12= -xpatrat-6x-16
c) 2xpatrat-5x+8x-20+2xpatrat+2x+3x+3-4xpatrat-8= 8x-25
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