3/4a³b(-4/9ab²)=

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3/4a³b(-4/9ab²)=

3/4a³b(-4/9ab²)=
3/4a³b(-4/9ab²)=

3/4a³b(-4/9ab²)=
3/4a^3b(-4/9ab^2
=3/4*(-4/9)(a^3b)(ab^2)
=-(1/3)a^4b^3