12/7

\(\dfrac{12}{7}\)

\(\dfrac{72}{42}=\dfrac{72:6}{42:6}=\dfrac{12}{7}\)

\(\dfrac{72\times75}{125\times108}\) = \(\dfrac{36\times2\times25\times3}{25\times5\times36\times3}\) = \(\dfrac{2}{5}\)

Bằng 12/7 nha!

72/42= 12/7

được:12/7

\(\dfrac{8}{45}\)

= 8/45

⁸/₄₅

90/70 và 72/42 nhé em gửi nó bị lỗi

\(\dfrac{-8}{12}=\dfrac{-8:4}{12:4}=\dfrac{-2}{3}\\ \dfrac{15}{-60}=\dfrac{15:15}{-60:15}=\dfrac{1}{-4}\\ \dfrac{-16}{-72}=\dfrac{-16:\left(-8\right)}{-72:\left(-8\right)}=\dfrac{2}{9}\\ \dfrac{35}{14.15}=\dfrac{5.7}{7.2.5.3}=\dfrac{1}{2.3}=\dfrac{1}{6}\)

-2/3

-1/4

2/9

1/6

-8/12= -2/3

15/-60= 1/-4

-16/-72= 2/9

35/14.15= 1/6

a: Các phân số tối giản là \(\dfrac{1}{3};\dfrac{4}{7};\dfrac{72}{73}\) vì ƯCLN(1;3)=1; ƯCLN(4;7)=1; ƯCLN(72;73)=1

b:

Các phân số rút gọn được là

 \(\dfrac{8}{12}=\dfrac{8:4}{12:4}=\dfrac{2}{3}\)

\(\dfrac{30}{36}=\dfrac{30:6}{36:6}=\dfrac{5}{6}\)

\(\frac{72}{54}=\frac{72:18}{54:18}=\frac{4}{3}\)            \(\frac{18}{54}=\frac{18:18}{54:18}=\frac{1}{3}\)

\(\frac{35}{210}=\frac{35:35}{210:35}=\frac{1}{6}\)      \(\frac{90}{72}=\frac{90:18}{72:18}=\frac{5}{4}\)

\(\frac{9}{36}=\frac{9:9}{36:9}=\frac{1}{4}\)          \(\frac{30}{48}=\frac{30:6}{48:6}=\frac{5}{8}\)

\(\frac{72}{42}=\frac{72:6}{42:6}=\frac{12}{7}\)

4/3,1/6,1/3,5/4,1/4,5/8,12/7

nhớ k cho mình nha

\(\frac{72}{54}=\frac{8}{6}=\frac{4}{3}\)                          \(\frac{35}{210}=\frac{7}{42}=\frac{1}{6}\)

\(\frac{18}{54}=\frac{2}{6}=\frac{1}{3}\)                          \(\frac{90}{72}=\frac{10}{8}=\frac{5}{4}\)

\(\frac{9}{36}=\frac{3}{12}=\frac{1}{4}\)                         \(\frac{30}{48}=\frac{10}{16}=\frac{5}{8}\)

                         \(\frac{72}{42}=\frac{36}{21}=\frac{12}{7}\)

\(\dfrac{60}{72}=\dfrac{60:12}{72:12}=\dfrac{5}{6}\\ \dfrac{70}{95}=\dfrac{70:5}{95:5}=\dfrac{14}{19}\\ \dfrac{150}{360}=\dfrac{150:30}{360:30}=\dfrac{5}{12}\)

\(\dfrac{60}{72}=\dfrac{5}{6}\)

\(\dfrac{70}{95}=\dfrac{14}{19}\)

\(\dfrac{150}{360}=\dfrac{5}{12}\)