Jawapan

2016-07-15T11:42:10+08:00
A)21xy-14y
b)7x-xy-7y+y²
c)10m+9-6m-10
d)7p+1-6p-3+2p
e)10k+2k-3e+6k-2e
f)w/8-2+w/4-9+1/2w