Question

1) Rút gọn phân số

21/28=

18/54=

72/42=

2) điền dấu >,<,=

1...........3/4

100/99.........1

4/3.............3/4

9/11.............11/9

99/99.............1

Answer 1

21/28=3/4

18/54=1/3

72/42=36/21

1>3/4

100/99>1

4/3>3/4

9/11<11/9

99/99=1

Answer 2

B1) 21/28=3/4

18/54=1/3

72/42=12/7
B2) 1>3/4

100/99>1
4/3>3/4

9/11<11/9

99/99=1

K CHO MK NHA

Answer 3

\(1,\frac{21}{28}=\frac{21:7}{28:7}=\frac{3}{4}\)

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

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

\(2,\)   \(1>\frac{3}{4}\)

\(\frac{100}{99}>1\)

\(\frac{4}{3}>\frac{3}{4}\)

\(\frac{9}{11}< \frac{11}{9}\)

\(\frac{99}{99}=1\)

Answer 4

1,

\(\frac{21}{28}=\frac{3}{4};\frac{18}{54}=\frac{1}{3};\frac{72}{42}=\frac{12}{7}\);

2,

\(1>\frac{3}{4};\frac{100}{99}>1;\frac{4}{3}>\frac{3}{4};\frac{9}{11}< \frac{11}{9};\frac{99}{99}=1\)

Answer 5

1) Rút gọn phân số:

  \(\frac{21}{28}=\frac{3}{4}\)

\(\frac{18}{54}=\frac{3}{9}\)

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

2) Điền dấu >,<,=

1 > 3/4

100/99 < 1

4/3  > 3/4

9/11 < 11/9

99/99 = 1

  tk mk nha bạn !!! ^^

Answer 6

\(\frac{21}{28}\)=\(\frac{3}{4}\)

\(\frac{18}{54}\)=\(\frac{1}{3}\)

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

2. 1 > \(\frac{3}{4}\)

\(\frac{100}{99}\)> 1

  \(\frac{4}{3}\)> \(\frac{3}{4}\)

   \(\frac{9}{11}\)<\(\frac{11}{9}\)

    \(\frac{99}{99}\)=1