Question

Daca a=5/6, b+c=7/20 si c-d=1/24, calculati a*b+2*a*c-a*d

Answer 1

[tex]ab+2ac-ad=ab+ac+ac-ad=a(b+c+c-d)=\\ \frac{5}{6}(^{6)}\frac{7}{20}+^{5)}\frac{1}{24})=\frac{5}{6}\cdot \frac{42+5}{120}=\\ \frac{5}{6}\cdot\frac{47}{120}=\frac{47}{144}[/tex]