Question

va rooog , repede . nu stiu cum sa fac , nu am fost.

Answer 1

1
a)   x=nr rational pozitiv
x/3=1 1/6
x/3=7/6
x=7/2

b)  3x-0,1(3)=4,(5)
0,1(3)= (13-1)/90=12/90
4,(5)=(45-4)/9=41/9
3x-12/90=41/9
270x=410+12
x=422/270=1,5(629)

c)x+0,145=3,9
x=3,9-0,145=3,755

d) 4,(8)x-7x/8=2 1/6
 4,(8)x-7x/8=2 1/6
(48-4)x/9-7x/8=13/6
44x/9-7x/8=13/6
352x-63x=156
289x=156
x=156/289

e)  x/3+x/4=0,(21)
0,(21)=21/99=7/33
(4x+3x)/12=7/33
7x=7/33 *12
x=7*12/33*7=4/11