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\(\frac{28}{35}\times\frac{15}{72}\times1\frac{7}{49}=\frac{4}{5}\times\frac{5}{24}\times\frac{8}{7}=\frac{160}{840}=\frac{4}{21}\)
So sánh à bạn !?
Ta có: \(\frac{2}{35}\cdot\frac{15}{72}\cdot1=\frac{1}{84}\)
Ta lại có: \(\frac{7}{49}=\frac{7:7}{49:7}=\frac{1}{7}\)
Giờ ta đã có \(\frac{1}{84}and\frac{1}{7}\)
Ta có: Trong các phân số, phân số nào có mẫu nhỏ hơn thì phân số đó lớn hơn
Mà ta có: 1/7 có mẫu bé hơn
=> \(\frac{2}{35}\cdot\frac{15}{72}\cdot1< \frac{7}{49}\)
=4/5 . 5/24 . 16/9
= 1/6 . 16.9
=8/27
Đúng thì tk nha
Ai tk kb luôn
28/35x15/72x1và7/9=4/5x5/24x16/9=20/100x16/9=320/900=16/45
\(1\dfrac{1}{3}\times1\dfrac{1}{8}\times1\dfrac{1}{15}\times1\dfrac{1}{24}\times1\dfrac{1}{35}\)
= \(\dfrac{4}{3}\times\dfrac{9}{8}\times\dfrac{16}{15}\times\dfrac{25}{24}\times\dfrac{36}{35}\)
= \(\dfrac{4\times9\times16\times25\times36}{3\times8\times15\times24\times35}\)
= \(\dfrac{1\times2\times2\times25\times36}{1\times2\times15\times24\times35}\)
= \(\dfrac{4\times25\times36}{30\times24\times35}\)
= \(\dfrac{1\times25\times36}{30\times6\times35}=\dfrac{1}{7}\)
Sai rồi nhé! Từ dấu bằng thứ 2 xuống dấu bằng thứ 3 bạn làm sao đc z?
\(\dfrac{3}{6}=\dfrac{3:3}{6:3}=\dfrac{1}{2}\\ \dfrac{18}{24}=\dfrac{18:6}{24:6}=\dfrac{3}{4}\\ \dfrac{5}{35}=\dfrac{5:5}{35:5}=\dfrac{1}{7}\\ \dfrac{40}{90}=\dfrac{40:10}{90:10}=\dfrac{4}{9}\\ \dfrac{75}{30}=\dfrac{75:15}{30:15}=\dfrac{5}{2}\)
\(\dfrac{3}{6}=\dfrac{3:3}{6:3}=\dfrac{1}{2}\\ \dfrac{18}{24}=\dfrac{18:6}{24:6}=\dfrac{3}{4}\\ \dfrac{5}{35}=\dfrac{5:5}{35:5}=\dfrac{1}{7}\\ \dfrac{40}{90}=\dfrac{40:10}{90:10}=\dfrac{4}{9}\\ \dfrac{75}{30}=\dfrac{75:15}{30:15}=\dfrac{5}{2}\)
a) \(\dfrac{7}{11}+\dfrac{3}{4}+\dfrac{4}{11}+\dfrac{1}{4}=\left(\dfrac{7}{11}+\dfrac{4}{11}\right)+\left(\dfrac{3}{4}+\dfrac{1}{4}\right)=1+1=2\)
b) \(\dfrac{72}{99}-\dfrac{28}{99}-\dfrac{14}{99}=\dfrac{72-28-14}{99}=\dfrac{30}{99}=\dfrac{10}{33}\)
\(\dfrac{49}{28}:\dfrac{5}{4}.\dfrac{6}{7}=\dfrac{49}{28}.\dfrac{4}{5}.\dfrac{6}{7}=\dfrac{49.4.6}{28.5.7}=\dfrac{7.7.4.6}{4.7.5.7}=\dfrac{6}{5}\)
\(\dfrac{49}{28}:\dfrac{5}{4}\times\dfrac{6}{7}\)
= \(\dfrac{49}{28}\times\dfrac{4}{5}\times\dfrac{6}{7}\)
= \(\dfrac{7\times7}{4\times7}\) x \(\dfrac{4}{5}\) x \(\dfrac{6}{7}\)
= \(\dfrac{6}{5}\)
`4/5 xx 5/24xx 8/7`
`= 4/21`.
\(\dfrac{28}{35}\times\dfrac{15}{72}\times1\dfrac{7}{49}\)
\(=\dfrac{4}{5}\times\dfrac{5}{24}\times\dfrac{8}{7}\)
\(=\dfrac{4\times5\times8}{5\times24\times7}=\dfrac{160}{840}=\dfrac{4}{21}\)