Question

Efetue as adições algébricas:

a) 5ax - 11ax + 9ax - ax =

b) 7x²y⁵ + 3x²y⁵ - 12x²y⁵ + 5x²y⁵ =

c) xy - 7xy - 2xy + 13xy - 6xy =

d) 2a³ - 1/2a³ - 3/4a³ =

e) 3ab - 3/2ab - 5/2ab =

Answer 1

Primeiro fazemos conta com os números e depois adicionamos as letras no resultado : 

a) 5 - 11 + 9 - 1 = - 6 + 8 = 2ax

b) 7 + 3 - 12 + 5 = 10 - 7 = 3 x²$y^{5}$

c) 1 - 7 - 2 + 13 - 6 = -6 + 11 - 6 = -12 + 11 = - xy

d) 2 -1/2 - 3/4 = 8/4 - 2/4 - 3/4 = 3/4 a³

e) 3 - 3/2 - 5/2 = 6/2 - 3/2 - 5/2 = 3/2 -5/2 = - 2/2 = - ab                     ok

Answer 2

a) 5ax - 11ax + 9ax - ax => -6ax+8ax=> 2ax

b) 7x²y⁵ + 3x²y⁵ - 12x²y⁵ + 5x²y⁵=>10x²$y^{5}$-17x²$y^{5}$=>
=-7x²y⁵
c) xy - 7xy - 2xy + 13xy - 6xy =>-8xy+7xy=> -xy

d) 2a³ - 1/2a³ - 3/4a³ = 
 2 -1/2 - 3/4 = 8/4 - 2/4 - 3/4 = 3/4 a³

e) 3 - 3/2 - 5/2 = 6/2 - 3/2 - 5/2 = 3/2 -5/2 = - 2/2 = - ab