$$\frac { 10 } { 3 y } \times 9 y ^ { 5 }$$
$30y^{4}$
$$\frac{10\times 9}{3y}y^{5}$$
$$\frac{3\times 10}{y}y^{5}$$
$$\frac{3\times 10y^{5}}{y}$$
$$3\times 10y^{4}$$
$$30y^{4}$$
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$120y^{3}$
$$\frac{\mathrm{d}}{\mathrm{d}y}(\frac{10\times 9}{3y}y^{5})$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(\frac{3\times 10}{y}y^{5})$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(\frac{3\times 10y^{5}}{y})$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(3\times 10y^{4})$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(30y^{4})$$
$$4\times 30y^{4-1}$$
$$120y^{4-1}$$
$$120y^{3}$$
