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Sabi65
a fost răspuns

18.Rezolvati in Q ecuatiile:
a) 1/2 (x-5)-1/3 (-2x+6)=-5(x+1)+7;
b)2/5-(3x+1)+3/4(-x+8) = +3(x –1)+6;​

Răspuns :

Alexandraandrei13

a) 1/2x-5/2-2/3x+6/3=-5x-5+7

(aplificam cu 2 si 3)

3x-15-4x+16=-5x-5+7

-x+5x=2-16+15

4x=1

b) 2/5-3x-1-3/4x+24/4=3x-1+6

(aplificam cu 4 si 5)

8-3x-1-15x+120=3x-1+6

-18x-3x=5-8+1

-15x=2

x=-2/15