Question

1.Aflati valoarea lui a/b daca a=2,4 iar b=1,6
2. determinati valoarea raportului dintre 1,2 ha si 250 m(patrati)
3. daca a/b=4/3 aflati 3a/2b
4.daca 5x/2y=1,25 aflati y/x
5.Daca a/b=3,5 si a+b=16, aflati numerele a si b
6.daca x/y=0,(6) aflati x/x+y
7.cunoscand a/b=0,(27) sa se determine 1+3b-11a
Va rog sa imi raspundeti.nu trebuie neaparat la toate, daca stiti una dintre ele este ok :) va multumesc mult!

Answer 1

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Answer 2

1)a/b=2,4/1,6=1,5
2)1,2ha/ 250mp=12.000mp/250mp=48
3)a/b=4/3 =>3a=4b
3a/2b=4b/2b=2
4)5x/2y=1,25
  5x/2y=125/100
  500x=250y
       x=250y/500
x=y/2
y/x=y/y/2=y ori2/y=2y/y=2
5)a/b=3,5    a+b=16=.>a=16-b
a/b=35/10
10a=35b
a=35b/10
35b/10+b=16
35b+10b/10=16
45b=16x10
45b=160
b=160/45
b=32/9
a+32/9=16
a=16 -32/9
a=9x16/9-32/9
a=144-32/9
a=112/9
a+b=16
112/9+32/9=16
144/9=16
6)x/y=0,(6)
x/y=6/9
9x=6y
y=9x/6
x/x+y=x/ x+9x/6= x/ 6x/6+9x/6=x/15x/6=x/15x ori 1/6=x/90x=1/90
7)a./b=0,(27)
a/b=27/99
99a=27b
a=27b/99
a=3b/11
1+3b -11a=1+3b- 11(3b/11)=1+3b-3b=1