$\mathop {({3 \over {15}})}\nolimits^5 \times \mathop {({{20} \over 9})}\nolimits^5 \div \mathop {({3 \over 2})}\nolimits^4 = \mathop {({1 \over 5})}\nolimits^5 \times \mathop {({{20} \over 9})}\nolimits^5 \div \mathop {({3 \over 2})}\nolimits^4 = \mathop {({4 \over 9})}\nolimits^5 \div \mathop {({3 \over 2})}\nolimits^4 = \mathop {({{\mathop 2\nolimits^2 } \over {\mathop 3\nolimits^2 }})}\nolimits^5 \div \mathop {({3 \over 2})}\nolimits^4 = \mathop {({2 \over 3})}\nolimits^{10} \times \mathop {({2 \over 3})}\nolimits^{ - 4} = \mathop {({2 \over 3})}\nolimits^6 $