Răspuns: Ai demonstrația mai jos pentru fiecare subpunct
Explicație pas cu pas:
Salutare!
(A)
[tex]\bf \dfrac{2}{10} =\dfrac{3}{15}\implies 2\cdot 15 =3\cdot 10 = 30[/tex]
sau
[tex]\bf \dfrac{2}{3} =\dfrac{10}{15}\implies 2\cdot 15 =3\cdot 10 = 30[/tex]
(B)
[tex]\bf \dfrac{7}{21} =\dfrac{4}{12}\implies 7\cdot 12 =4\cdot 21 = 84[/tex]
sau
[tex]\bf \dfrac{7}{4} =\dfrac{21}{12}\implies 7\cdot 12 =4\cdot 21 = 84[/tex]
(C)
[tex]\bf \dfrac{5}{35} =\dfrac{6}{42}\implies 5\cdot 42 =6\cdot 35 = 210[/tex]
sau
[tex]\bf \dfrac{5}{6} =\dfrac{35}{42}\implies 5\cdot 42 =6\cdot 35 = 210[/tex]
(D)
[tex]\bf \dfrac{8}{32} =\dfrac{7}{28}\implies 8\cdot 28 =7\cdot 32 = 224[/tex]
sau
[tex]\bf \dfrac{8}{7} =\dfrac{32}{28}\implies 8\cdot 28 =7\cdot 32 = 224[/tex]
#copaceibrainly
