6a+7 dan 2a-4 -x³+5xy dan 9x-15y+10 9x+15y-9 dan 9x-15y+10 5p-2pq+6q dan -4p+3pq-5q

cari sendiri
y baca buku

a. (6a+7)+(2a-4) = 6a+2a+7-4 = 8a+3
b. (-x"'+5y)+(9x-15y+10) = -x"'+9x+5y-15y+10 = -x"'+9x-15y+10
c. (9x+15y-9)+(9x-15y+10) = 9x+9x+15y-15y-9+10 = 18x+1
d. (5p-2pq+6q)+(-4p+3pq-5) = 5p-4p-2pq+3pq+6-5 = p+pq+1

maaf klo salah...