a, x + \(2\frac{3}{4}\)= \(5\frac{2}{3}\)
= x + \(\frac{11}{4}\)= \(\frac{17}{3}\)
x = \(\frac{17}{3}\)- \(\frac{11}{4}\)
x = \(\frac{35}{12}\)
b , x - \(1\frac{4}{5}\)= \(3\frac{2}{7}\)
= x - \(\frac{9}{5}\)= \(\frac{23}{7}\)
x = \(\frac{23}{7}\)+ \(\frac{9}{5}\)
x = \(\frac{178}{35}\)
c , x * \(\frac{31}{2}\)= \(4\frac{3}{4}\)
= x * \(\frac{31}{2}\)=\(\frac{19}{4}\)
x = \(\frac{19}{4}\): \(\frac{31}{2}\)
x = \(\frac{38}{124}\)= \(\frac{19}{64}\)
d , x : 2 2/? = 4 1/3 câu d thiếu nha bạn