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Nr x si y direct proportionale cu2 si 7..aflati numerele stiind ca suma este 1..si cat reprezinta x din y

Răspuns :

Renatemambouko
x/2=y/7         y=7x/2
x+y=1
x+7x/2=1
2x+7x=2
9x=2
x=2/9
y=2/9 ×7/2=7/9

x=2/9
y=7/9
x=2/9 :7/9=2/9 × 9/7=2/7=0,(285714)=28,(571428)%

Falcuta205
x+y=1
x/2=k
x=2k
y/7=k
y=7k
2k+7k=1
9k=1
k=1/9
x=1/9*2
x=2/9
y=1/9*7
y=7/9
y=7/9 din 100%
y=100/9*7
y=77,(7)%
x=2/9 din 100%
x=100/9*2
x=22,(2)%
100/(x/y)=77,(7)%/22,(2)%
100/(x/y)=3,5%
x/y=100/3,5%
x/y=28,(571428)%