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Answer 1

Вариант 1.

1.

$frac{a {}^{8}b {}^{5} c {}^{20}}{a {}^{10}b {}^{4} c {}^{3} } = a {}^{ - 2} bc {}^{17 } = frac{bc {}^{17} }{a {}^{2} }$

2.

$frac{3a + 3b}{4a + 4b} = frac{3(a + b)}{4(a + b)} = frac{3}{4} = 0.75$

3.

$frac{a {}^{2} - 9 }{3a + 9} = frac{(a - 3)(a + 3)}{3(a + 3)} = frac{a - 3}{3}$

4.

$frac{(a + 2) {}^{2} }{7a {}^{2} + 14a } = frac{(a + 2) {}^{2}}{7a(a + 2)} = frac{a + 2}{7a}$

5.

$frac{y {}^{2} - 16 }{4y {}^{2} - y {}^{3} } = frac{(y - 4)(y + 4)}{ - y {}^{2} ( - 4 + y)} = - frac{y + 4}{y {}^{2} }$

6.

$frac{(a + 1) {}^{2} + (a - 1) {}^{2} }{3(a {}^{2} + 1) } = \ frac{a {}^{2} + 2a + 1 + a {}^{2} - 2a + 1 }{3(a {}^{2} + 1) } = \ frac{2(a {}^{2} + 1)}{3(a {}^{2} + 1) } = frac{2}{3}$