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36

a] 4x + 7x = (4 + 7)x = 11x
b] 21y - 11y = (21 - 11)y = 20y
c] 1,5x + 7x +x = (1,5 + 7 + 1) x = 9,5x
d] 5/7y - 2/7y = (5/7 - 2/7)y = 3/7

37

A = 4a + 5a
A = 9a

B = 9b - 2b
B = 7b

C = 6a² + a²
C = 7a²

D = 15a +12a -3a
D = 27a - 3a
D = 24a

38

A = 11a - a + 3b + b
A = 10a + 4b

B = 11,5a² + 5a + 0,5a²
B = 12a² + 5a

C = 4/2x + 6/2x
C = 10/2x
C = 5x

D = 1/10a + 1/4b +2/5a +3/4b
D = 1/10a + 4/10a + 4/4b
D = 5/10a + 1b
D = 0,5a + b 

36a] 4x + 7x = (4 + 7)x = 11x
b] 21y - 11y = (21 - 11)y = 20y
c] 1,5x + 7x +x = (1,5 + 7 + 1) x = 9,5x
d] 5/7y - 2/7y = (5/7 - 2/7)y = 3/737A = 4a + 5a
A = 9aB = 9b - 2b
B = 7bC = 6a² + a²
C = 7a²D = 15a +12a -3a
D = 27a - 3a
D = 24a38A = 11a - a + 3b + b
A = 10a + 4bB = 11,5a² + 5a + 0,5a²
B = 12a² + 5aC = 4/2x + 6/2x
C = 10/2x
C = 5xD = 1/10a + 1/4b +2/5a +3/4

D = 1/10a + 4/10a + 4/4b
D = 5/10a + 1b
D = 0,5a + b