tlong dbntu kk.. yg tw tlong jwab pleasee..

( a^-1.b^2)^2 / (a^-9.b^-2)
= (a^(-1.2).b^(2.2) / (a^-9.b^-2)
= (a^-2.b^4) / (a^-9.b^-2)
= a^(-2- -9).b^(4 - -2)
= a^(-2+9).b^(4+2)
= a^7.b^6