Jawabanmu

2014-08-29T07:40:08+07:00
A. 15 + 3(×-2) ⇒ 15 + 3× - 6
                      ⇒ 9 + 3×
b. 5(×-2y) - 3(2×-y) ⇒ 5× - 10y - 6× + 3y
                              ⇒ -7y - ×
2014-08-29T11:55:51+07:00
A. 15+3(x-2)
=15+3x-6
=15-6+3x
=9+3x

b. 5(x-2y)-3(2x-y)
=5x-10y-6x+3y
=5x-6x-10y+3y
=-1x-7y