Question

Rezolvati in Q+ ecuatiile:
a) 2(x+1/5=1 intreg 3/4
b) 1/4(x+6/7)=5/7
c) 0,5(x+2/99)=0,75
d) 3/5(x-1/2)=6
e) 0,(2)ori(x-1)=1/4
f) 1/7 [x-0,(23)]=5/14
/=supra
DAU COROANA CELUI CARE RASPUNDE PRIMUL SI DAU 20 DE PUNCTE

Answer 1

x+1/5=1/2=>x=5/10-2/10=>x=3/10(amplificam prima fractie cu 2 si pe a doua cu 5)

x+6/7=20/7=>x=20/6=>x=10/3

x+2/99=0,75/0,25=>x=99/99-2/99=>x=97/99

x-1/2=6*5/3=>x-1/2=10=>x=20/2-1/2=>x=19/2

x-1/2=1/4:2/9=> x-1/2=1*9/4*2=>x=9/8-1/2=>x=5/8

x-23/99=5/2=>x=5/2*99/23=>x=495/46