[tex] \frac{4}{63} + \frac{1}{18}- \frac{4}{25} * \frac{5}{7} =[/tex]
[tex]\frac{4}{63} + \frac{1}{18}- \frac{4}{35} =[/tex]
amplifici cu 2 prima fractie si cu 7 pe a doua
[tex]\frac{8}{126} + \frac{7}{126}- \frac{4}{35} =[/tex]
acum amplifici prima fractie cu 5 iar pe a doua cu 18
[tex]\frac{75}{630} - \frac{72}{630} = \frac{3}{630} = \frac{1}{210} [/tex]
