Пошаговое объяснение:

1)

m = -3,75

n = 0,785

m + n = -2,965

2)

m = 2,6

n = -1,94

m + n = 0,66

3)

m =  -[tex]\frac{2}{7}[/tex]

n = 1

m + n = [tex]\frac{5}{7}[/tex]

4)

m = 4,2

n = -4,2

m + n = 0

5)

m = [tex]\frac{3}{14}[/tex]

n = -[tex]\frac{11}{21}[/tex]

m + n = [tex]\frac{9-22}{42}[/tex] = - [tex]\frac{13}{42}[/tex]

6)

m = -1

n = [tex]\frac{5}{9}[/tex]

m + n = -[tex]\frac{4}{9}[/tex]