Question

1.a)3/5+x=2/3 b)x-1/3=5/3 c)2/3x=1/4 d)1,5x=6
2.calculati media aritmetica a numerelor 1/2, 1/3 si 1/4

4.determinati un numar,stiind ca daca la dublul acestuia adunam 2/5 obtinem 1,9

Answer 1

a)3/5+x=2/3⇒3+5x/5=2/3⇒3(3+5x)=5×2⇒9+15x=10⇒15x=10-9⇒15x=1⇒x=1/15
b)x-1/3=5/3⇒3x-1/3=5/3⇒3(3x-1)=3×5⇒9x-3=15⇒9x=15+3⇒9x=18⇒x=18/9⇒x=2
c)2/3x=1/4⇒2×4=3x×1=8=3x⇒8⇒x=8/3
d)1.5x=6⇒x=6/1.5⇒x=4
2)1/2+.1/3.+1/4/3=6+4+3/12/3=13/12/3⇒13/12×1/3⇔13/36
sucees