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→ 2)• a) (13a - 8b) + (21a + 9b)
= (13+21)a + (9-8)b
= 34a + b
• b) (15i - 14j + 13k) + ( -30i - 45j + 51k)
= -(30-15)i - (14+45)j + (13+51)k
= -15i - 59j + 64k
• c) (3x - 17y + 35z) + (4x + 23y - 9z)
= (3+4)x +(23-17)y + (35-9)z
= 7x + 6y + 26z
→ 4). 5z + 3 - (2z - 7)
= 5z - 2z + 3 + 7
= 3z + 10
→ 5). 6x + 4 - ( x - y )
= 6x - x + 4 + y
= 5x + 4 + y
a. 13a-8b+21a+9b= 34a+b
b. 15i-14j+13k-30i-45j+51k= -15i-59j+64k
c. 3x-17y+35z+4x+23y-9z= 7x+6y+26z
3
a. 42n+35m+7+50m+20n-9= 62n+85m-2
b.5x-x+3+1=4x+4
c. 12y-4y+15z-8= 8y+15z-8
konsep jumlah selisih aljabar adalah variabel yang sama dikumpulkan..
:)