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Ответ:

Пошаговое объяснение:

[tex]2\frac{2}{5} :0.4=\frac{12}{5} :\frac{4}{10} =\frac{12}{5} *\frac{10}{4} =\frac{6}{1} =6[/tex]

[tex]6-3.7=2.3[/tex]

[tex]\frac{1}{4} *10=\frac{1}{4} *\frac{10}{1} =\frac{5}{2} =2\frac{1}{2} =2.5[/tex]

[tex]2.5+3.5=6[/tex]

[tex]3.25*4=13\\[/tex]

[tex]13-\frac{3}{5} =\frac{13}{1} -\frac{3}{5} =\frac{65}{5} -\frac{3}{5} =\frac{62}{5} =12\frac{2}{5} =12.4[/tex]

[tex]2\frac{1}{2} :0.5=\frac{5}{2} :\frac{5}{10} =\frac{5}{2} *\frac{10}{5} =\frac{5}{1} =5[/tex]

[tex]5+3.6=8.6[/tex]

[tex]1\frac{3}{4} *0.4=\frac{7}{4} *\frac{4}{10} =\frac{7}{10} =0.7[/tex]

[tex]0.7+0.3=1[/tex]

[tex]\frac{7}{10} :0.2=\frac{7}{10} :\frac{2}{10} =\frac{7}{10} *\frac{10}{2} =\frac{7}{2} =3\frac{1}{2} =3.5[/tex]

[tex]3.5-0.5=3[/tex]