a/ 3/5 * 8/27 * 5/3
=3*8*5/5*27*3
=8/27(rút gọn)
b/ 7/19 * 1/3 +7/19 * 2/3
=7/19 * (1/3 + 2/3)
=7/19 * 1
=7/19
3/5x8/27x5/3=8/27x3/5x5/3=8/27x1=8/27
7/19x1/3+7/19x2/3=7/19x(1/3+2/3)=7/19x1=7/19
a, \(\frac{3}{5}\)x \(\frac{8}{12}\) x \(\frac{5}{3}\)
= \(\frac{24}{60}\)x \(\frac{5}{3}\)
= \(\frac{120}{180}\)= \(\frac{2}{3}\)
b,\(\frac{7}{19}\) x \(\frac{1}{3}\)+ \(\frac{7}{19}\)x \(\frac{2}{3}\)
= \(\frac{7}{19}\)x \(\left(\frac{1}{3}+\frac{2}{3}\right)\)
= \(\frac{7}{19}\)x \(\frac{3}{3}\)
=\(\frac{7}{19}\)x 1
=\(\frac{7}{19}\)
chúc bạn học tốt