1.(1÷a的负一次方)(1÷b的负一次方)(ab)
=ab(ab)=a^2*b^2.
2.[x^m÷x^(2n)]^3÷x^(2m-n)
=[x^(m-2n)]^3÷x^(2m-n)
=x^[3(m-2n)-(2m-n)]
=x^(m-5n),
与2x3是同类项,
∴m-5n=3.
m+5n=?
解得m=?,n=?……
1.(1÷a的负一次方)(1÷b的负一次方)(ab)
=ab(ab)=a^2*b^2.
2.[x^m÷x^(2n)]^3÷x^(2m-n)
=[x^(m-2n)]^3÷x^(2m-n)
=x^[3(m-2n)-(2m-n)]
=x^(m-5n),
与2x3是同类项,
∴m-5n=3.
m+5n=?
解得m=?,n=?……