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Vladandrei2008
a fost răspuns

a:b=3,c:b=5,d:a=2r5,a+b+c+d=20​

Răspuns :

a+b+c+d=20

a:b=3

a=3b

c:b=5

c=5b

d:a=2 rest 5

d=2a+5

d=2×3b+5

d=6b+5

3b+b+5b+6b+5=20

15b+5=20

15b=20-5

15b=15

b=15:15

b=1

a=3×1

a=3

c=5×1

c=5

d=6×1+5

d=6+5

d=11