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Dati factorul comun in urmatorele exerciti :
A × b + a × c =
B × x - b •y =
12 • a + 36 • a =
8 • a + a • b =
A • x + a =
6 • a + 5 • a • b =
3 • a - 2 • a =
B • a • c - c =
X •a + y × a - z • a =