a)
3\frac{2}{3}-0.3=3\frac{2}{3}-\frac{3}{10}=3\frac{20}{30}-\frac{9}{30}=3\frac{11}{30}
b)
\frac{1}{3}+1.4=\frac{1}{3}+1\frac{2}{5}=\frac{5}{15}+1\frac{6}{15}=1\frac{11}{15}
c)
3.25-\frac{2}{3}=3\frac{1}{4}-\frac{2}{3}=3\frac{3}{12}-\frac{8}{12}=2\frac{15}{12}-\frac{8}{12}=2\frac{7}{12}
d)
6\frac{1}{6}-2.2=6\frac{1}{6}-2\frac{1}{5}=6\frac{5}{30}-2\frac{6}{30}=5\frac{35}{30}-2\frac{6}{30}=3\frac{29}{30}
e)
9.4-5\frac{3}{7}=9\frac{2}{5}-5\frac{3}{7}=9\frac{14}{35}-5\frac{15}{35}=8\frac{49}{35}-5\frac{15}{35}=3\frac{34}{35}
f)
0.8*\frac{1}{2}=\frac{8}{10}*\frac{1}{2}=\frac{8}{20}=\frac{2}{5}
g)
\frac{3}{4}*4.8=\frac{3}{4}*4\frac{4}{5}=\frac{3}{4}*\frac{24}{5}=\frac{72}{20}=3\frac{12}{20}=3\frac{3}{5}
h)
3.6*\frac{5}{8}=3\frac{3}{5}*\frac{5}{8}=\frac{18}{5}*\frac{5}{8}=\frac{90}{40}=2\frac{10}{40}=2\frac{1}{4}
i)
1\frac{1}{2}*4.1=1\frac{1}{2}*4\frac{1}{10}=\frac{3}{2}*\frac{41}{10}=\frac{123}{20}=6\frac{3}{20}
j)
5.25:2\frac{1}{2}=5\frac{1}{4}:2\frac{1}{2}=\frac{21}{4}:\frac{5}{2}=\frac{21}{4}*\frac{2}{5}=\frac{42}{20}=2\frac{2}{20}=2\frac{1}{10}
k)
6\frac{2}{7}:1.1=6\frac{2}{7}:1\frac{1}{10}=\frac{44}{7}:\frac{11}{10}=\frac{44}{7}*\frac{10}{11}=\frac{440}{77}=5\frac{55}{77}=5\frac{5}{7}
l)
4.42:3\frac{2}{5}=4\frac{21}{50}:3\frac{2}{5}=\frac{221}{50}:\frac{17}{5}=\frac{221}{50}*\frac{5}{17}=\frac{1105}{850}=1\frac{255}{850}=1\frac{51}{170}
m)
1\frac{2}{3}:4.5=1\frac{2}{3}:4\frac{1}{2}=\frac{5}{3}:\frac{9}{2}=\frac{5}{3}*\frac{2}{9}=\frac{10}{27}
Zobacz jeszcze raz na przykład l), czy napewno jest 4.42. Jak coś to pisz.