Odpowiedź :
Odpowiedź:
[tex]1.\ \ \frac{3}{4}+\frac{2}{3}:\frac{8}{12}+(1\frac{1}{2})^2=\frac{3}{4}+\frac{2}{3}:\frac{2}{3}+(\frac{3}{2})^2=\frac{3}{4}+\frac{\not2^1}{\not3_{1}}\cdot\frac{\not3^1}{\not2_{1}}+\frac{9}{4}=\frac{12}{4}+1=3+1=4[/tex]
[tex]2.\ \ (\frac{1}{3}+\frac{2}{7}):(1-\frac{1}{9})+\frac{3}{7}=(\frac{7}{21}+\frac{6}{21}):(\frac{9}{9}-\frac{1}{9})+\frac{3}{7}=\frac{13}{21}:\frac{8}{9}+\frac{3}{7}=\frac{13}{\not21_{7} }\cdot\frac{\not9^3}{8}+\frac{3}{7}=\\\\=\frac{39}{56}+\frac{3}{7}=\frac{39}{56}+\frac{24}{56}=\frac{63}{56}=1\frac{7}{56}=1\frac{1}{8}[/tex]
[tex]3.\ \ 1\frac{1}{4}\cdot2+1,2\cdot\frac{5}{12}=\frac{5}{\not4_{2}}\cdot\not2^1+\frac{\not12^1}{\not10_{2}}\cdot\frac{\not5^1}{\not12_{1}}=\frac{5}{2}+\frac{1}{2}=\frac{6}{2}=3[/tex]