[tex]4,2 +\frac{1}{4} = 4,2 + 0,25 = 4,45\\2,2 - \frac{3}{4} = 2,2 -0 ,75 = 1,45\\7,1 - \frac{1}{8} = 7,1 - 0,125 = 6,975\\9,4 - \frac{3}{8} = 9,4 - 0,375 = 9,025\\0,7 + \frac{1}{2} = 0,7 = 0,5 = 1,2\\\frac{2}{3} * 7,2 = \frac{2}{3} * \frac{72}{10} = \frac{24}{5} = 4 \frac{4}{5} \\1\frac{4}{5} : 0,25 = \frac{9}{5} : \frac{1}{4} = \frac{9}{5} * \frac{4}{1} = \frac{36}{5} = 7\frac{1}{5} \\4,4 * \frac{1}{5} = \frac{44}{10} * \frac{1}{5} = \frac{44}{50} = \frac{22}{25} \\[/tex]
[tex]3,6 *\frac{1}{9} =\frac{36}{10} *\frac{1}{9} = \frac{4}{10} =\frac{2}{5} \\5,25 : 2\frac{1}{3} = 5\frac{1}{4} : \frac{7}{3} = \frac{21}{4} * \frac{3}{7} = \frac{9}{4} = 2\frac{1}{4} \\\frac{7}{8} *2,2 - (0,5)^{2} = \frac{7}{8} * \frac{22}{10} - 0,5 * 0,5 = \frac{154}{80} - 0,25 = \frac{154}{80} - \frac{1}{4} = \frac{154}{80} - \frac{20}{80} = \frac{134}{80} = 1\frac{54}{80} = 1 \frac{27}{40} \\[/tex]
[tex]\frac{1}{5} * 0,3 - \frac{1}{2} *2,2 = \frac{1}{5} * \frac{3}{10} - \frac{1}{2} *\frac{22}{10 } = \frac{3}{50} - \frac{11}{10} = \frac{3}{50} - \frac{55}{50} = -\frac{52}{50} = - 1\frac{2}{50}=-1 \frac{1}{25} \\20,5 :\frac{2}{5} - 0,3 * \frac{3}{4} = \frac{41}{2} *\frac{5}{2} - \frac{3}{10} *\frac{3}{4} = \frac{205}{4} - \frac{9}{40} = \frac{2050}{40} - \frac{9}{10} = \frac{2041}{40} = 51 \frac{1}{40}[/tex]
Mam nadzieję że pomogłam i liczę na naj. ♥
