Bài 16: Tính nhanh:
a, A = \(\frac{17}{23}\times\frac{8}{16}\times\frac{23}{17}\times\left(-80\right)\times\frac{3}{4}\)
b. C = \(\left(\frac{13}{23}+\frac{1313}{2323}-\frac{131313}{232323}\right)\times\left(\frac{1}{3}+\frac{1}{4}-\frac{7}{12}\right)\)