Дам 55 балов решите пожалуйста

Решите задачу:

$1. x^5x^{12} =x^{5+12}=x^{17}\\ 2. y^4y^{11}=y^{4+11}=y^{15}\\ 3. z^{20}z^6=z^{20+6}=z^{26}\\ 4. 40^{20}\cdot40^3=40^{20+3}=40^{23}\\ 5. (0.3)^7 \cdot (0.3)^{29}=(0.3)^{7+29}=(0.3)^{36}\\ 6. (8.4)^3 \cdot (8.4)^{15}=(8.4)^{3+15}=(8.4)^{18}\\ 7. ( \frac{2}{7} )^{31}\cdot( \frac{2}{7} )^6=( \frac{2}{7} )^{31+6}=( \frac{2}{7} )^{37}\\ 8. ( \frac{15}{19} )^3 \cdot ( \frac{15}{19} )^{19}= ( \frac{15}{19} )^{3+19}= ( \frac{15}{19} )^{22}$
$9. (4 \frac{4}{9} )^{14} \cdot (4 \frac{4}{9} )^{28}=(4 \frac{4}{9} )^ {14+28}=(4 \frac{4}{9} )^ {42}\\ 10. (-5)^4 \cdot (-5)^{11} = (-5)^{4+11}=(-5)^{15}\\ 11. (- \frac{1}{3} )^4 \cdot (- \frac{1}{3} )^8 = (- \frac{1}{3} )^{4+8}=(- \frac{1}{3} )^{12}\\ 12. (-6.2)^6 \cdot (-6.2)^7=(-6.2)^{6+7}=(-6.2)^{13}\\ 13. (-c)^{10} \cdot (-c)^{51}=(-c)^{10+51}=(-c)^{61}\\ 14. (- \frac{d}{2} )^9 \cdot (- \frac{d}{2} )^9 = (- \frac{d}{2} )^{9+9}=(- \frac{d}{2} )^{18}$
$15. (-1.4k)^5 \cdot (-1.4k)^{20}=(-1.4k)^{5+20}=(-1.4k)^{25}$