Matematică
eremiaelena1971
2017-03-03 12:11:00
DIN SUFLEET ROOG!!! DAU URGENT COROANA!!! Multumesc
Răspunsuri la întrebare
iliusha158
2017-03-03 13:08:28

1. a) x+1= (x-5)^2 x+1=x^2-10x+25 x^2-11x+24=0 delta= 121-96=25 x1= (11+5):2=8 x2=(11-5):2=3 b)x-1=(x-7)^2 x-1= x^2-14x+49 x^2-15×+48=0 delta= 225-192= 33 x1, x2=(15+/- radical din 33):2 c)x+1=(2x+1)^2 x+1= 4x^2+4x+1 4x^2+3x=0 x (4x+3)=0 x=0 sau 4x+3=0 ×=-3/4 d)x^2-3x+4=(2+x)^2 x^2-3x+4=4+4x+x^2 x=0 e)17+2x-3x^2=(x+1)^2 17+2x-3x^2= x^2+2x+1 4x^2-16=0 x^2=4 x=1 sau x=-1 f)x^2+2x+10= (2x-1)^2 x^2+2x+10= 4x^2-4x+1 3x^2-6x-9=0 x^2-2x-3=0 delta= 4+12=16 x1=(2+4):2=3 x2=(2-4):2=-16 2. a) (1-x)^2 radical (2x-5)=0 ( 1-x)^2=0 sau radical (2x-5)=0 1-2x+x^2=0 2x-5=0 delta= 4-4=0 x=5/2 x1=x2=1 b) (3x^2-x-2) radical (1-4x)=0 3x^2-x-2=0 sau radical (1-4x)=0 delta = 1+24=25 x=1/4 x1=(1+5):6=1 x2=(1-5):6=-5/6 c) (1-3x) radical (x^2-2x+1)=0 1-3x=0 sau radical (x^2-2x+1)=0 x=1/3 x^2-2x+1=0 delta = 4-4=0 x1=x2=1 d)(x^2-5x+6)radical (2x^2-x-3)=0 x^2-5x+6=0 sau radical ( 2x^2-x-3)=0 delta=25-24=1 2x^2-x-3=0 x1=(5+1):2= 3 delta=1-24= 25 x2=(5-1):2= 2 x1=(1+5):4=3/3 x2=(1-5):4=-1

Adăugați un răspuns