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a fost răspuns

fie proportile a supra b=1supra2 si c supra d= 3supra2 a)demostreaza a+2b+c supra b=4 b) stiind ca a+c=6 afla nr b

Răspuns :

a) a/b=1/2=k

a=1k

b=2k

c/d=3/2=k

c=3k

d=2k

a+2b+c/b=4(A)

1k+2×2k+3k/2k=4(A)

1k+4k+3k/2k=4(A)

8k/2k=4(A)

4=4(A)


b) a+c=6

1k+3k=6

4k=6

k=6/4

k=3/2

b=2×3/2

b=3



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