Question

a)4a : 3,7 = 16 :7,4
b)5x : 3 = 0,3 : 5
c)$\frac{2x}{9}$ = $\frac{5}{8}$
d)$\frac{2}{5}$ = $\frac{3x}{55}$
зарание спасибо!

Answer 1

$a) \frac{4a}{3,7} =\frac{16}{7,4} \\\\4*7,4*a=16*3,7\\\\a=\frac{16*3,7}{4*7,4} \\a=2$

$b) \frac{5x}{3} =\frac{0,3}{5} \\5x*5=0,3*3\\25x=0,9\\x=\frac{0,9}{25} \\x=0,036$

$c)\frac{2x}{9} = \frac{5}{8}\\2x*8=5*9\\16x=45\\x=\frac{45}{16} =2\frac{13}{16}$

$d)\frac{2}{5} = \frac{3x}{55}\\3x*5=55*2\\\\x=\frac{55*2}{5*3} \\\\\x=\frac{22}{3} =7\frac{1}{3}$