Question 328311
1) {{{200^0/400 =1/400}}}
2) {{{(u^8*z^7)/ (z^(-3)u^(-2))=u^(8-(-2))z^(7-(-3))=u^10z^10=(uz)^(10)}}}
3) {{{-(3a^6b^4)^3=-(27a^18b^12)=-27a^18b^12}}}
4) I think you meant to write
{{{((6a^2)/(7b^3))^(-2)=((7b^3)/(6a^2))^2=(49/36)(b^6/a^4)=(49b^6)/(36a^4)}}}