Jawapan

2015-01-02T11:48:26+08:00
=2(13x-8y) + 2(9x-7y)
=26x-16y+8x-14y
=26x+8x-16y-14y
=34x - 30y
:)




2015-01-05T13:52:05+08:00
Perimeter segiempat tepat
=2(9x - 7y) + 2(13x - 8y)
=18x - 14+ 26x - 16y
=18x + 26x - 14y - 16y
=
44x - 30y