Jawabanmu

2014-09-03T19:52:34+07:00
10x(2y-10)=20xy-100x
(x+5) (5x-1)=5x kwadrat -x+25x-5
=5x kwadrat +24x-5
(7-2x)(2x-7)=14x-49-4x kwadrat+14x
=-4x kwadrat+28x-49