104. Упростите выражение: 1) (х + 3)(х - 7) - 4x(5 – 2х); 2) (x + 2)(y - 6) + (y + 3)(y - 4); 3) (х – 3)(3х + 1) - (2x + 3)(4х – 1); 4) (2а - 3b)(7а + 4b) - (3,5а + b)(4а - 6b); 5) (m³ - 3n)(m² + 2n) - 4m³(m³ + 7n). ; ​
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