Question

4/63+1/18-(2/5)²x5/7

Answer 1

$\frac{4}{63} + \frac{1}{18}- \frac{4}{25} * \frac{5}{7} =$

$\frac{4}{63} + \frac{1}{18}- \frac{4}{35} =$

amplifici cu 2 prima fractie si cu 7 pe a doua

$\frac{8}{126} + \frac{7}{126}- \frac{4}{35} =$

acum amplifici prima fractie cu 5 iar pe a doua cu 18

$\frac{75}{630} - \frac{72}{630} = \frac{3}{630} = \frac{1}{210}$