[tex]1)\\\\ -3(a-2ab)+a(9-4b)= -3 a+6ab + 9a-4ab =6a+2ab\\\\a=-\frac{1}{2},\ \ b=-3\\\\6a+2ab=\not{6}^3*(-\frac{1}{\not{2}^1})+\not{2}^1*(-\frac{1}{\not{2}^1})*(-3)=-3+3=0[/tex]
[tex]2)\\\\ 2p(3r-5)-4r(6-0,25p)= 6 p r-10p-24r+ pr=7pr-10p-24r\\\\p=\frac{1}{7},\ \ \ r=-1\\\\ 7pr-10p-24r=\not{7}^1 *\frac{1}{\not{7}^1}*(-1)-10*\frac{1}{7}-24*(-1)= -1-\frac{10}{7}+24=\\\\=-1\frac{3}{7}+23=21\frac{4}{7}[/tex]
[tex]3)\\\\ 9(3a^2+5a)-15a(3-6a)=27a^2+45a -45a +90a^2=117a^2\\\\a=-\frac{1}{3}\\\\117a^2=117*(-\frac{1}{3})^2=\not{117 }^{13}*\frac{1}{\not{9}^1}=13[/tex]
