Jawabanmu

2014-08-31T07:49:11+07:00
2014-08-31T08:36:48+07:00
(2x-x)(2x-x)=4x^2 - 2x^2 -2x^2 +x^2
=4x^2 - 4x^2+x^2
=x^2
tanda ( ^ ) = artinya pangkat ya

(x/y-x/y)-(x/y + x/y)=X^2/y^2 +x^2 /y^2 +x^2/y^2-x^2/y^2
=2x^2 /2y^2