1Oblicz x. A)5:3=2x:12 B) 1/3=2/4x+5 C)2,7/3,6=4/x D) 1 1/5 / 0,75=4,4/3x /kreska ulamkowa

A) 5:3 = 2x:12 [latex] frac{5}{3} [/latex] = [latex] frac{2x}{12} [/latex]    /·12 4·5=  2x 20 = 2x 2x = 20    /:2 x = 10 B) [latex] frac{1}{3} [/latex] = [latex] frac{2}{4x+5} [/latex] C) [latex] frac{2,7}{3,6} [/latex] = [latex] frac{4}{x} [/latex] 2,7x = 4·3,6 2,7x =  14,4 /:2,7 x = 14,4 : 2,7 x = 144 : 27 x = [latex] frac{144}{27} [/latex] x = 5[latex] frac{9}{27} [/latex] x = 5[latex] frac{1}{3} [/latex] D)[latex] frac{1 frac{1}{5} }{0,75}[/latex] = [latex]frac{4,4}{3x} [/latex] [latex]1frac{1}{5}: frac{3}{4}[/latex] = [latex]frac{4,4}{3x}[/latex] [latex]frac{6}{5}[/latex]·[latex] frac{4}{3} [/latex] = [latex]frac{4,4}{3x}[/latex] [latex] frac{8}{5} [/latex] = [latex]frac{4,4}{3x}[/latex] 24x = 5·4,4 24x = 22    /:24 x = [latex] frac{22}{24} [/latex] x = [latex] frac{11}{12} [/latex]