NHẦM LÀM LẠI :
\(B=\left(5+7+1\right)+\left(\frac{19}{29}+\frac{10}{29}\right)+\left(\frac{43}{52}+\frac{9}{52}\right)+\frac{1}{7}=13+1+1+\frac{1}{7}=15\frac{1}{7}\)
B=\(\left(5+\frac{1}{7}+\frac{19}{29}\right)+\left(7+\frac{43}{52}+1+\frac{10}{29}\right)+\frac{9}{52}=\left(5+7+1\right)+\left(\frac{19}{29}+\frac{10}{29}\right)+\left(\frac{43}{52}+\frac{10}{52}+\frac{9}{52}\right)+\frac{1}{7}=13+1+1+\frac{1}{7}=15\frac{1}{7}\)