Jawabanmu

2014-08-17T22:22:18+07:00
A1. (13a - 8b) + (12a + 9b)
= 13a - 8b + 12a + 9b
= 25a + b

A2. -

A3. (5x + 3) - (x - 1)
= 5x + 3 -x + 1
=4x +4

A4. (5z + 3) - (2z - 7)
= 5z + 3 -2z + 7
= 3z + 10
2) tentukan hasil penjumlahan (3-17x + 35z) dan (4x+ 23y - 9)
(3 - 17x + 35z) + (4x + 23y - 9) = 3 -9 -17x + 4x+ 35z + 23y = -6 -13 +35z +23y
maaf ** -13x **