109.
(a+3)7 = a^2 ab
(x-y)10 = 10x — 10y
a (x-y) = ax — ay
a (a+b) = a^2 + ab
(a+b-c)2 = 2a+2b-2c
(a+b)(-6) = -6b -6b
x (x-y+c) = x^2 — xy + xc
(a-b) 5a = 5a^2 — 5ab
110.
(-2) (x+y) = — 2x — 2y
(7+3y-x^2y) (-2xy) = 2x^3y^2 — 6xy^2 — 14xy
3ab (a^2 — 2a + 1) =
2a (x + y) = 2ax + 2ay
(x^2 + 2xy + y^2) (-12xy^3) =
21a^2b^5 (a^3 — 4ab^2 — b^2) =
(-abc)(ab + ac + bc) =
-ac (a + 2c) =
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