tính hợp lý giá trị các biểu thức sau :
B= 71\(\dfrac{38}{45}\) - ( 43\(\dfrac{8}{45}\) - 1\(\dfrac{17}{57}\) )
D= ( 19\(\dfrac{5}{8}\) : \(\dfrac{7}{12}\) - 13\(\dfrac{1}{4}\) : \(\dfrac{7}{12}\) ) . \(\dfrac{4}{5}\)
F= ( 9,75 . 21\(\dfrac{3}{7}\) + \(\dfrac{39}{4}\) . 18\(\dfrac{4}{7}\) ). \(\dfrac{15}{78}\)
Loga
Toán lớp 6
