x
?
?
64y
?
=
(
x
?
____________________
)
(
x
?
+
____________________
?
y
+
4x³y²
+
____________________
+
16xy
?
+
____________________
?
)
16x
?
?
81y
?
=
(
____________________
?
3y
)
(
____________________
+
12x²y
+
____________________
+
27y³
)
x
?
y
?
+
64z
?
=
(
xy
+
____________________
)
(
x
?
y
?
?
____________________
+
x²y²z²
?
____________________
+
z
?
)
