tentukan hasil penjumlahan bentuk al jabar berikut : A.(13a-8b) +(21a+9b)= .... B.(15i-14j+13k)+(30i-45j+51k)=.... C. (3x-17y+35z)+(4x+23y-9z)=.... tolong dijaw

A.13a-7b+21a+9b
= 13a+21a-7b+9b
=34a+2b

B.15i-14j+13k+30i-45j+51k
=15i+30i-14j-45j+13k+51k
=45i-59j+64k

C.3x-17y+35z+4x+23y-8z
=3x+4x-17y+23y+35z-8z
=7x+6y+27z

Materi : Aljabar
Kelas : VII

(13a - 8b) + (21a + 9b)
= 13a - 8b + 21a + 9b
= 13a + 21a - 8b + 9b
= 34a + b

(15i - 14j + 13k) + (30i - 45j + 51k)
= 15i - 14j + 13k + 30i - 45j + 51k
= 15i + 30i + 14j - 45j + 13k + 51k
= 45i - 31j + 64k

(3x - 17y + 35z) + (4x + 23y - 9z)
= 3x - 17y + 35z + 4x + 23y - 9z
= 3x + 4x - 17y + 23y + 35z - 9z
= 7x + 6y + 24z