Question

Rezolvati urmatoarele ecuatii unde x este o fractie zecimala a)2x+3,5=5,3 b) 3x-0,12=12 c) 11,5-5x=1,1 d) 8,25+8x=21,19 e) x:6+13,51=29,39 f) (x+3). 2,5 =14,5 2) Determinati numerele naturale x a) x+5,2≤13 b) 28,6 -x∠19,3 c) x:3+1,5≤12,6 d) 2,6·2,25+x+∠15 va rog mult

Answer 1

a)2x+3.5=5.3⇒2x=5.3-3.5⇒2x=1.8⇒x=1.8/2⇒x=0.9
b)3x-0.12=12⇒3x=0.12+12⇒3x=12.12⇒x=12.12/3⇒4.04
c)11.5-5x=1.1⇒11.5-1.1=5x⇒10.4=5x⇒x=10.4/5⇒x=2.08
d)5.25+8x=21.19⇒8x=21.19-5.25⇒8x=15.94⇒x=15.94/8⇒x1.9925
e)x÷6+13.51=29.39⇒x÷6=29.39-13.51⇒x÷6=15.88⇒
x=6×15.88⇒x=95.28
f)(x+3)×2.5=2.5x+7.5=2.5x=-7.5⇒x=-7.5/2.5⇒x=-3

2)a)x+5.2≤13⇒x≤13-5.2⇒x≤7.8
b)28.6-x≤19.3⇒28.6-19.3≤x⇒x≤9.3
c)x÷3+1.5≤12.6⇒x÷3≤12-1.5⇒x÷3≤10.5⇒x≤3×10.5⇒x≤31.5
d)2.6×2.25+x≤15⇒5.85+x≤15⇒x≤-5.85+15⇒x≤-9.15
sucees