Помогите сроооочнооооо!даю 45 баллов!номер 1 и 2

Номер 1
1)8,4*(-5,7)= $- \frac{84}{10} * \frac{57}{10} = -\frac{84}{10} * \frac{57}{10}= \frac{4788}{100} =-47,88$

2) = $- \frac{28}{3} *- \frac{26}{21} = \frac{728}{63} = 11\frac{35}{63}$

3)= $\frac{2223}{100} :- \frac{9}{10} = - \frac{2223}{100} * \frac{10}{9} =- \frac{247}{10} =-24,7$

4)= $-\frac{2898}{100} :-14 = \frac{2898}{100*14} = \frac{207}{100} =2,07$

Номер 2

1)=25,2*x*y
2)=-5m+4p
3)=k-17+k-k+30=k+13
4)=-24-6a+8a-48=2a-72