[tex]a)\\-2(2y+3x)+(-4y+2x+1) = -4y-6x-4y+2x+1 = -4x-8y+1\\\\b)\\-(x-2xy)-(4x+xy)+(xy-x) = -x+2xy - 4x - xy + xy - x = -6x + 2xy\\\\c)\\(x^{2}+2x+1)-(x^{2}-4x+3) = x^{2}+2x+1 - x^{2}+4x-3 = 6x-2\\\\d)\\\frac{30a^{2}b}{5}\cdot2b - (3a+a\cdot2ab^{2}) = 12a^{2}b^{2}-(3a+2a^{2}b^{2}) = 12a^{2}b^{2}-3a-2a^{2}b^{2} =\\\\= 10a^{2}b^{2}-3a[/tex]
