Question

Помогите пожалуйста!!! Нужны все кроме 1

Answer 1

-2.4*(2.5a-1.5b)+0.5(1.8b+5.6a)=-$frac{24}{10}*( frac{25}{10}a- frac{15}{10}b)+ frac{5}{10}*( frac{18}{10}b+ frac{56}{10}a)= \ \ =- frac{24*25}{10}a+ frac{24*15}{10}b+ frac{5*18}{10}b + frac{5*56}{10}a= \ \ =- frac{3*8*5*5}{10}a+ frac{5*7*8}{10}a+ frac{4*6*5*3}{10}b + frac{5*3*6}{10}b= \ \ = frac{2*4*5*a*(7-3*5)}{2*5}+ frac{3*5*2*3*b*(4+1)}{2*5}=4a(7-15)+9b(4+1)= \ \ =4a*(-8)+9b*5 =-32a+45b$

Answer 2

3/10*(6/5x-1/2y)-3/2*(2/5x+y)=3/2*(1/5*(6/5x-1/2y)-(2/5x+y))=3/2*(6/25x-1/10y-2/5x-y)=3/2*(-4/25x-11/10y)