Выполните умножение:
а)(х – 3)(х + 3)

б) (6 – х)(6 + х)

в) (х + 2у)(2у – х)

г) ( - а + 2)(а + 2)

д) (5х + 4у)(4у – 5х)

е) (14 + у)(14 – у)

ё)( 9х – у2)(9х + у2)

ж) (- 5х2 + 1)(1 + 5х2)

з) (6ас + 5)(5 – 6ас)

и) (с3 – а3)(с3 + а3)
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