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

1.a)x=2/3-3/5
x=10-9/15
x=1/15
b)x=5/3+1/3
x=6/3
x=2
c)x=1/4*3/2
x=3/8
d)x=6/1,5
x=4
2.m.a.=1/2+1/3+1/4/3=
6+4+3/12/3=13/12*1/3=
13/36
3.
2x+2/5=1,9
2x=1,9-2/5
2x=9,5-2/5
2x=7,5/5
2x=1,5
x=1,5/2
x=0,75