Question

va rog ma ajuatiii/???e urgent! ex 1 si 2

Answer 1

1.
a)
x+1/4=1.5 => x+1/4 =15/10  =>x+1/4=3/2  /inmultim in ambele parti cu 4 => 4*x+1=6 =>x=5/4
b) x/6=1,1(6) => x/6 =(116-11)/90 => x/6=105/90=> x/6=21/18 => x/6=7/6 => x=7
c) 2*x-3/2=2,5-2*x=> 2*x-3/2=25/10-2*x=>2*x-3/2=5/2-2*x => 4*x-3=5-4*x =>8*x=8=>x=1

2.
a)(2*x-1)/5=2 ,x=3 => (2*3-1)=10 <=>  5=10 F
b)4*x+2,25=25/4 => 4*x+225/100=25/4 <=> 4*x+9/4=25/4 <=> 4*x=16/4 <=> x=1 (A)
c)numerele rationale pot fi si 'nenaturale' ex: 3/4