а) (3x-1)²=9x²-6x+1
2)(6x-4)(6x+4)=36x²-16
3)(2x-3)²-9=4x²-12x+9-9=4x²-12x
4)(4x-5)(4x+5)+18x²=16x²-25+18x²=34x²-25
5) 3(x-2)²-(2x+5)(2x-5)=3x²-12x+12-4x²+25=-x²-12x+37
а) (3x-1)²=9x²-6x+1
2)(6x-4)(6x+4)=36x²-16
3)(2x-3)²-9=4x²-12x+9-9=4x²-12x
4)(4x-5)(4x+5)+18x²=16x²-25+18x²=34x²-25
5) 3(x-2)²-(2x+5)(2x-5)=3x²-12x+12-4x²+25=-x²-12x+37