1.Oblicz. a) 5[latex] frac{1}{7} [/latex] × 1[latex] frac{5}{9} [/latex] - 6 ÷ 4[latex] frac{2}{3} [/latex] = b)3[latex] frac{1}{4} [/latex] × ( 2[latex] frac{1}{4} [/latex] - 1[latex] frac{1}{2} [/latex] ÷ 6 ) =

[latex]a)\5frac{1}{7}*1frac{5}{9}-6:4frac{2}{3}=frac{36}{7}*frac{14}{9}-frac{6}{1}:frac{14}{3}=frac{8}{1}-frac{6}{1}*frac{3}{14}=8-frac{9}{7}=8-1frac{2}{7}=6frac{5}{7}[/latex] [latex]b)\3frac{1}{4}*(2frac{1}{4}-1frac{1}{2}:6)=frac{13}{4}*(2frac{1}{4}-frac{3}{2}:frac{6}{1})=frac{13}{4}*(2frac{1}{4}-frac{3}{2}*frac{1}{6})=\\frac{13}{4}*(2frac{1}{4}-frac{1}{4})=frac{13}{4}*2=frac{13}{4}*frac{2}{1}=frac{13}{2}=6frac{1}{2}[/latex]

[latex]\a) \frac{36}{7}*frac{14}{9}-6:frac{14}{3}=4*2-6*frac{3}{14}=8-frac97=7-frac27=6frac57 \ \b) \frac{13}{4}(frac94-frac32:6)=frac{13}{4}(frac94-frac{1}{4})=frac{13}{4}*2=frac{13}{2}=6frac12[/latex]