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Ответ:

5

x

+

5

y

=

5

x+y

____

\frac{a}{4} + \frac{b}{4} = \boxed{ \frac{a + b}{4} }

4

a

+

4

b

=

4

a+b

____

\frac{a}{y} + \frac{2a}{y} = \frac{a + 2a}{y} = \boxed{ \frac{3a}{y} }

y

a

+

y

2a

=

y

a+2a

=

y

3a

___

\begin{gathered} \\ \frac{5 {b}^{2} }{3a} + \frac{13 {b}^{2} }{3a} = \frac{5b {}^{2} + 13b {}^{2} }{3a} = \frac{18b {}^{2} \: | \div 3}{3a \: | \div 3} = \boxed{ \frac{6b {}^{2} }{a} }\end{gathered}

3a

5b

2

+

3a

13b

2

=

3a

5b

2

+13b

2

=

3a∣÷3

18b

2

∣÷3

=

a

6b

2

___

\frac{x + y}{19} + \frac{2x}{19} = \frac{x + y + 2x}{19} = \boxed{ \frac{3x + y}{19} }

19

x+y

+

19

2x

=

19

x+y+2x

=

19

3x+y

___

\frac{2c - x}{2b} + \frac{x}{2b} = \frac{2c - x + x}{2b} = \frac{2c \: \div 2}{2b \: \div 2} = \boxed{ \frac{c}{b} }

2b

2c−x

+

2b

x

=

2b

2c−x+x

=

2b÷2

2c÷2

=

b

c