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p - 2q - 4r + (3p + 5q - 5r)
= p - 2q - 4r + 3p + 5q - 5r
= p + 3p - 2q + 5q - 5r - 4r
= 4p + 3q - 9r
2.
pengurangan a dri b ialah b - a
4a - 7c - 6b - ( 5a + 6b - 3c)
= 4a - 7c - 6b - 5a - 6b + 3c
= 4a - 5a - 6b - 6b - 7c + 3c
= - a - 12b - 4c
semogamembantu♣
= p - 2q - 4r dan 3p + 5q - 5r
= p - 2q - 4r + 3p + 5q - 5r
= p + 3p -2q + 5q - 4r - 5r
= 4p + 3q - 9r
No. 2 :
= 5a + 6b - 3c dari 4a - 7c - 6b
= 4a - 7c - 6b - (5a + 6b - 3c)
= 4a - 7c - 6b - 5a - 6b + 3c
= 4a - 5a - 6b - 6b - 7c + 3c
= -a -12b - 4c