Răspuns:
a) {a, b} d. p {4;9}
a/4=b/9=k
a=4k
b=9k
a/b =0,(4)
4k/9k=4/9
4/9=4/9 adevărat
[tex]b) \sqrt{a \times b} = 12 \\ \sqrt{4k \times 9k} = 12 \\ \sqrt{36 {k}^{2} } = 12 \\ \sqrt{36} \times \sqrt{ {k}^{2} } = 12 \\ 6k = 12 \\ k = 2 \\ a = 4k = 4 \times 2 = 8 \\ b = 9k = 9 \times 2 = 18[/tex]
