Упростите выражение. a) -2a(3a-b)+6(a-b)(a+b) б) (2m-3n)^2+(3m-2n)^2 в)...

Question

Упростите выражение.
a) -2a(3a-b)+6(a-b)(a+b)
б) (2m-3n)^2+(3m-2n)^2
в) (x^2y^3+1)(x^2y^3-1)-x^4y

Answer 1

a) -2a(3a-b)+6(a-b)(a+b) = -6a²+2ab+6a²-6b² = 2ab-6b².
б) (2m-3n)²+(3m-2n)² = 4m²-12mn+9n²+9m²-12mn+4n² = 13m²-24mn+13n².
в) (x²y³+1)(x²y³-1)-x⁴y = x⁴y⁶-1-x⁴y.