Question

1.rezolvati ecuatiile: a) 2x+1,7=3,5
b) 3x-18,25=13,89
c) 9,57-5x+3,4=5,002
d) 1,6x-3,3=1,5
e)2,1x-32,1=9,6
f)2,3-0,3x=0,8
2.Determinati x apartine N, astfel incat:
a)0,5x+0,12 b)1,8x+5, 97<12,36
c)15,903-6x >sau egal 2,001
d)15, 903-6x>sau egal 2,001

(20 pcte)

Answer 1

a)2x+1.7=3.5⇒2x=3.5-1.7⇒2x=1.8⇒x=1.8/2⇒x=0.9
b)3x-18.25=13.89⇒3x=13.89+18.25⇒3x=32.14⇒x=32.14/3⇒x=10.71(3)
c)9.57-5x+3.4=5.002⇒12.97-5x=5.002⇒-5x=5,002-12.97⇒-5x=-7.968⇒x=-7.968/-5⇒x=1.5936
d)1.6x-3.3=1.5⇒1.6x=3.3+1.5⇒1.6x=4.8⇒x=4.8/1.6⇒x=3
e)2.1x-32.1=9.6⇒2.1x=32.1+9.6⇒2.1x=41.7⇒x=41.7/2.1⇒x=19.857
f)2.3-0.3x=0.8⇒-0.3x=-2.3+0.8⇒0.3x=1.5⇒x=1.5/0.3⇒x=5
2

a)0.5x+0.12=0⇒0.5x=-0.12⇒x=-0.12/0.5⇒x=-0.24
b)1.8x+5.97<12.36⇒1.8x<12.36-5.97⇒1.8x<6.39⇒x<6.39/1.8⇒x<3.55
c)15.903-6x≥2.001⇒-6x≥-15.903+2.001⇒-6x=-13.902⇒x=-13.902/-6⇒x=2.317
succes

Answer 2

a)2x=1,8 X=0,9 b)3x=32,14 x=10,71(3) c)9,57-5x=1,602 5x=-7,968 x=-1,5936 d)1,6x=4,8 X=3 E)2,1x=41,7 X=19,857.... F)-0,3x=-1,5 X=5 2)b)1,8x<6,39 X<3,55 c)-6x>=-14,12 X>=2,3(6) D) este la fel ca și C