Question

a) 1/4 - 3 (1/12 + 3/8 ) 

b) ( -2/3 + 3/5 ) : 1/50 - 30

mọi người giải giúp em vs ạ em cần gấp ạ. xin cảm ơn

 

Answer 1

a) \(\dfrac{1}{4}-3\left(\dfrac{1}{12}+\dfrac{3}{8}\right)=\dfrac{1}{4}-\dfrac{1}{4}-\dfrac{9}{8}=-\dfrac{9}{8}\)

b) \(\left(-\dfrac{2}{3}+\dfrac{3}{5}\right):\dfrac{1}{50}-30=\left(-\dfrac{2}{3}+\dfrac{3}{5}\right).50-30=-\dfrac{100}{3}+30-30=-\dfrac{100}{3}\)