Упростить.1.[latex](m-b)(m+b)-(m+b)^2 /mb+b^2 [/latex]2.

1.12a-6a^2+5-2a+3a^2=-3a^2+10a+52.12a^2-9a-20a+15=12a^2-29a+153.(m^2-b^2-m^2-2mb-b^2)/(mb-b^2)(-2b^2-2mb)/(mb-b^2)(2b(-b+m))/(b(m-b))(2b(m-b))/(b(m-b))2b/b2