Question

[Ngân Phương]

tính hợp lí

a) -19/34 - (31/51-54/35)         b) -2/5 . 4/15 + (-0,4). 26/ 15

Answer 1

[ILoveMath]

\(a,\dfrac{-19}{34}-\left(\dfrac{31}{51}-\dfrac{54}{35}\right)=\dfrac{-19}{34}-\left(-\dfrac{1669}{1785}\right)=\dfrac{79}{210}\\ b,\dfrac{-2}{5}.\dfrac{4}{15}+\left(-0,4\right).\dfrac{26}{15}=-\dfrac{8}{75}-\dfrac{52}{75}=-\dfrac{4}{5}\)