Question

Помогите срочно
Даю 40 баллов

Answer 1

1.

а) $\frac{c}{6b}*\frac{3ab}{c}=\frac{a}{2}$

б) $\frac{3}{5x}*10x=\frac{3*10x}{5x} =6$

в)  $\frac{xy}{3}:(9y^2)=\frac{xy}{3*9y^2}=\frac{x}{27y}$

г) $\frac{5m^2}{n} :\frac{m}{n^3}=\frac{5m^2*n^3}{n*m}= 5mn^2$

2.

a) $\frac{x}{x+y} :\frac{2x}{5x^{2} -5y^2}= \frac{x}{x+y} :\frac{2x}{5(x^{2} -y^2)}= \frac{x}{x+y} *\frac{5*(x-y)*(x+y)}{2x}= 2,5x-2,5y$

б)  $\frac{a+7}{a^2-9} *\frac{a-3}{2a+14} =\frac{a+7}{(a-3)*(a+3)} *\frac{a-3}{2(a+7)} =\frac{1}{2a+6}$

в)  $\frac{y^2-2y+1}{21y} :\frac{y-1}{7y} =\frac{(y-1)^2}{21y} *\frac{7y}{y-1} =\frac{y-1}{3}$

г)  $\frac{b^3}{b+c} *\frac{b^2-c^2}{3b^2} =\frac{b^3*(b-c)*(b+c)}{(b+c)*3b^2}=\frac{b(b-c)}{3} =\frac{b^2-bc}{3}$