31.21. 1) (a - y)(a + y)(a2 + y^); 2) (7x + 1)(7x - 1)(49x + 1); 3) (x - 6y')2 · (x + 6y')"; 4)(8 + x)(8 - x'). (64 + x'); 5) (25x2 + y^)(5x + y)(5x - y); 6)(81a4+1664)(969 +4a")(4a4-96).

ismoilov97    1   25.01.2022 18:56    4