Question

VĂ ROG E URGENT. Rezolvati in multimea numerelor naturale ecuatiile : a) 8x=16; b) 8x-4=0; c) 10-x=2; d) 12x-9=4; e) 3(x+5)=15; f) 4x+5=3(x+1)+7; g) 8x+3=3(x+1)+4x.

Answer 1

a) 8x=16=> x=16/8 <=> x=2
b) 8x-4=0 => 8x=0+4 <=> 8x=4 => x=4/8 <=> x=1/2 
c) 10-x=2 => x=10-2 <=> x=8
d) 12x-9=4 => 12x= 9+4 <=> 12x=13 => x=13/12
e) 3(x+5)=15 <=> 3x+15=15 => 3x=0 => x=0
f) 4x+5=3(x+1)+7 <=> 4x+5=3x+3+7 <=< 4x+5=3x+10<=> 4x-3x=10-5<=> x=5