Question

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Answer 1

Объяснение:

9)

$\frac{3m {}^{2} - 3n {}^{2} }{m {}^{2} p} \div \frac{6m - 6n}{mp} =\frac{\left(3m^{2}-3n^{2}\right)mp}{m^{2}p\left(6m-6n\right)} =\frac{3m^{2}-3n^{2}}{m\left(6m-6n\right)} =\frac{3\left(m+n\right)\left(m-n\right)}{6m\left(m-n\right)} =\frac{m+n}{2m}$

10)

$\frac{c + d}{c - d} \div \frac{c {}^{2} + cd}{2c {}^{2} - 2d {}^{2} } =\frac{\left(c+d\right)\left(2c^{2}-2d^{2}\right)}{\left(c-d\right)\left(c^{2}+cd\right)} =\frac{2\left(c-d\right)\left(c+d\right)^{2}}{c\left(c+d\right)\left(c-d\right)} =\frac{2\left(c+d\right)}{c} =\frac{2c+2d}{c}$