Phân số và hỗn số đó các bạn giúp mình với
\(\frac{4}{5}\times\frac{3}{7}+\frac{3}{7}\times\frac{1}{5}+2\frac{3}{7}\)
\(=\frac{3}{7}\times\left(\frac{1}{5}+\frac{4}{5}\right)+\frac{17}{7}\)
\(=\frac{3}{7}+\frac{17}{7}\)
\(=\frac{20}{7}\)
\(\frac{4}{5}\) x \(\frac{3}{7}\) + \(\frac{3}{7}\) x \(\frac{1}{5}\) + 2\(\frac{3}{7}\)
= \(\frac{3}{7}\)x ( \(\frac{1}{5}\) + \(\frac{4}{5}\) ) +2\(\frac{3}{7}\)
= \(\frac{3}{7}\) x 1 +2\(\frac{3}{7}\)
= \(\frac{3}{7}\) + 2\(\frac{3}{7}\)
= \(\frac{3}{7}\) + \(\frac{17}{7}\)
= \(\frac{20}{7}\)
k nha
4/5x3/7+3/7x1/5+2+3/7=3/7x(4/5+1/5)+2+3/7=3/7+2+3/7=6/7+2=20/7
