Помогите пожалуйста <3
Упростите выражения.
1. (3x-2)(3x+2)-3( x²-2x)=
2. (5a+b)²-5a(a+3)=
3. (3c-d)²-(3x-d)=
4. (2x-3)(2x+3)-(x+2)²=
5(5x+1)²-4x(6x+5)-(x+3)(x-3)=
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