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Buna.ma ajuta si pe mine cineva?
a) 2(x+4)-5(x+3)=4(x-1)+19
b) 12/5-[1/10+(-11/5-x)]=1/5
c)3+1-x/2=(1/2)²+0,75

Răspuns :

Miky93
a) 2x+8 -5x -15=4x-4+19

-3x -7= 4x +15

-3x-4x =15+7
-7x= 22

x= -22/7

b)12/5 - [1/10 +( -11/5 -x)]=1/5   aducem la acelasi numitor in (...)

-[1/10 +(-11-5x)/5]= 1/5 -12/5

-[1/10 +(-11-5x)/5]= -11/5

1/10 +(-11-5x)/5 = 11/5   aducem la acelasi numitor

1-22-10x =22

-21-10x=22

-10x=22+21

-10x= 43

x= -43/10= -4,3

c)3+(1 -x)/2 = (1/2)² + 75/100

3+ 1-x/2= 1/4 + 3/4  aducem la acelasi numitor

36+12-6x =3 +9

48-6x =12

-6x=12-42

-6x= -30

6x=30

x= 5

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