Question

Buna,puteti sa-mi rezolvati aceste exercitii,va rog? Dau coroana la cel care raspunde primul! 2 (x-1) =4,x apartine lui Z ; (-5)x - (-8)=8, x apartine lui Z ; (-4)(-x) +(-7) =9, x apartine lui Z ; 3x+1-x=5; 4x+5-x=15, x apartine lui N; 1.2.3.4.5.6.x- 3.4.5.6.7.x=0 ( . inseamna ori ''x''); (x+1) +(x+2)+(x+3) + (x+4)=1+2+3+4; 5x3=4x; -2x+1=2x-1; 4(x+1) =4x; 3(x-1)=3x-3

Answer 1

2x-2=4⇒2x=4+2⇒2x=6⇒x=6:2⇒x=3
-5x+8=8⇒-5x=8-8⇒-5x=0⇒x=0
4x-7=9⇒4x=9+7⇒4x=16⇒x=16:4⇒x=4
2x+1=5⇒2x=5-1⇒2x=4⇒x=4:2⇒x=2
3x+5=15⇒3x=15-5⇒3x=10⇒x=10/3 aici x nu apartine N;x=Ф
720x-2520x=0⇒x=0
4x+10=10⇒4x=10-10⇒x=0:4⇒x=0
4x=15⇒x=15/4⇒
-4x=-2⇒x=(-2):(-4)=x=1/2
4x+4=4x⇒4x-4x=-4⇒0=-4⇒ecuatia nu are sens
3x-3=3x-3  ⇒x poate lua orice valoare