tolong ya ,,no 11 - 14

11.-
12-
13.)
a.5x-3x
=2x
b.9+4x-1
=9-1+4x
=8+4x
c.4x-8x+12
=-4x+12
d.7-2x-x+5
=7+5-2x-x
=12-2x
e.3x²+3y²-5xy+2x²-5y²+6xy
=3x²+2x²+3y²-5y²-5xy+6xy
=5x²+(-2y²)+11xy