Помогите!!!!!!Пожалуйста!!!!!!!

А)
$\frac{ {16}^{17} + {16}^{16} }{17} = \frac{ {16}^{16} (16 + 1)}{17} = \frac{ {16}^{16} \times 17}{17} = {16}^{16}$
б)
$\frac{ {5}^{12} + {5}^{10} }{13} = \frac{ {5}^{10} ( {5}^{2} + 1)}{13} = \frac{ {5}^{10} \times 26 }{13} = 2 \times {5}^{10}$
в)
$\frac{ {49}^{5} + {7}^{8} }{350} = \frac{ {7}^{10} + {7}^{8} }{350} = \frac{ {7}^{8}( {7}^{2} + 1) }{350} = \frac{ {7}^{8} \times 50}{350} = \frac{ {7}^{8} }{7} = {7}^{7}$
г)
$\frac{ {321}^{3} - {123}^{3} }{198} = \frac{(321 - 123)( {321}^{2} - 321 \times 123 + {123}^{2} )}{198} = \frac{198 \times ( {321}^{2} - 321 \times 123 + {123}^{2} )}{198} = 321^{2} - 321 \times 123 + {123}^{2}$