a] [tex]2,4+1,3=2+1+0,4+0,3=3+0,7=3,7[/tex]
b] [tex]0,18-0,1=0,18-0,10=0,08[/tex]
c] [tex]3\cdot0,12=3\cdot12:100=36:100=0,36[/tex]
d] [tex]2,4:0,6=24:6=4[/tex]
j] [tex]2\frac{1}{2}\cdot3=2,5\cdot3=6+1,5=7,5[/tex]
k] [tex]3\frac{7}{9}:3=\frac{9\cdot3+7}{9} \cdot\frac{1}{3}=\frac{34}{9}\cdot \frac{1}{3} =\frac{24}{27}=\frac{8}{9}[/tex]
e] [tex]\frac{1}{2}+ \frac{1}{2}=\frac{2}{2} =1[/tex]
f] [tex]\frac{13}{15}- \frac{10}{15}= \frac{3}{15}= \frac{1}{5}[/tex]
g] [tex]2-1\frac{1}{7}=2-1-\frac{1}{7}=1-\frac{1}{7}=\frac{7}{7}- \frac{1}{7} =\frac{6}{7}[/tex]
h] [tex]\frac{2}{3}\cdot \frac{3}{7}= \frac{2}{1} \cdot\frac{1}{7}= \frac{2}{7}[/tex]
i] [tex]\frac{5}{9}: \frac{2}{3}= \frac{5}{9}\cdot \frac{3}{2}= \frac{5}{3}\cdot \frac{1}{2}=\frac{5}{6}[/tex]
