înmulțim pe diagonala și egalam
a)
[tex] \frac{x}{6} = \frac{14}{9} \\ 9x = 14 \times 6 \\ x = 84 \div 9 \\ x = \frac{84}{9} [/tex]
b)
[tex] \frac{4}{x} = \frac{10}{7} \\ 10x = 4 \times 7 \\ x = 28 \div 10 \\ x = \frac{28}{10} {}^{?(2} \\ x = \frac{14}{5} [/tex]
c)
[tex] \frac{2}{15} = \frac{x}{20} \\ 15x = 2 \times 20 \\ x = \frac{40}{15} {}^{(5} \\ x = \frac{8}{3} [/tex]
d)
[tex] \frac{8}{17} = \frac{12}{x} \\ 8x = 12 \times 17 \\ x = \frac{204}{8} {}^{(4} \\ x = \frac{51}{2} [/tex]
e)
x/25 = 7/10
10x=7•25
x=175/10 simplificam prin 5
x= 35/2
f) 21/x=14/9
14x=21•9
x=189/14 simplificam prin 7
x=27/2
g)5/27=x/36
27x=5•36
x=180/27 simplificam prin 9
x=20/3
h)24/7=21/x
24x=21•7
x=147/24 simplificam prin 3
x=49/8
