Question

1.Rezolvati in multimea numerelor rationale pozitive ecuatii:
a) 4x-12=18
b) 31=7x-11
c) x/2+5/6=11/4
d) 4(4x-3)=6x+23

Answer 1

a) 4x=18+12⇔4x=30⇔x=7,5∈Q pozitive
b) 7x=31+11⇔7x=42⇔x=6∈Q pozitive
c)x/2=11/4-5/6⇔x/2=23/12⇔x=23/6∈Q pozitive
d)16x-12=6x+23⇔16x-6x=23+12⇔10x=35⇔x=3,5∈Q pozitive