а)-2ab+4a-64a^2=-2a(b-2+32)=-2a(b+30)
-2*1.2(-3.8+30)=62.88
б)25a^2b^2-25a^2b^2*5ab=25a^2b^2(1-5ab)
25*4*3(1-5*4*3)=-17700
а)-2ab+4a-64a^2=-2a(b-2+32)=-2a(b+30)
-2*1.2(-3.8+30)=62.88
б)25a^2b^2-25a^2b^2*5ab=25a^2b^2(1-5ab)
25*4*3(1-5*4*3)=-17700