Question

Va rog din suflet est pentru azi
Daca nu o fac iau2 va dau coroniță dar vaa rog va ajutați ma
Va mulțumesc din suflet

Answer 1

6.

a)-4·(-25+15)=-4·(-10)=+40

b)8·(3/4-5/8-3 si 1/2)=

$8\cdot(\frac{3}{4}- \frac{5}{8}-3 \frac{1}{2}=8\cdot(\frac{3}{4}- \frac{5}{8}-\frac{3\cdot2+1}{2})=8\cdot(\frac{^{2)}3 }{4}- \frac{5}{8}-\frac{^{4)}7}{2})=8\cdot(\frac{6-5-14}{8})=-13$

$c)(\frac{7}{5}-2,5+5\frac{1}{2})\cdot(-10)=(\frac{7}{5}- \frac{25}{10}+\frac{5\cdot2+1}{2})\cdot(-10)=(\frac{^{2)}7}{5}- \frac{25}{10}+\frac{}11}{2})\cdot(-10)=\frac{(14-25+55)}{10}\cdot(-10)= \frac{44}{10}\cdot(-10)=-44$

$d)(\frac{2}{3}+\frac{5}{9}-2\frac{7}{12})\cdot(-7\frac{1}{5})=(\frac{2}{3}+\frac{5}{9}-\frac{2\cdot12+7}{12})\cdot(-\frac{7\cdot5+1}{5})=$

$(\frac{2}{3}+\frac{5}{9}-\frac{31}{12})\cdot(-\frac{36}{5})=(\frac{3\cdot4\cdot2+5\cdot4-31\cdot3}{3\cdot4\cdot3}\cdot(-\frac{36}{5})=\frac{24+20-39}{24}\cdot(-\frac{36}{5})=\frac{5}{24}\cdot(-\frac{36}{5})=\frac{-36}{24}=-\frac{9}{6}=-\frac{3}{2}$