Question

so sánh 2 phân số

3/5 và 14/10     7/8 và 5/2      15/7 và 8/64

Answer 1

`a, 3/5 < 1`

`14/10 > 1`

`=> 3/5 < 14/10`

`b, 7/8 < 1`

`5/2 > 1`

`=> 7/8 < 5/2`

`c, 15/7 > 1`

`8/64 < 1`

`=> 15/7 > 8/64`.

Answer 2

`a,` Ta có:

`14/10 = 7/5`

Vì `7/5 > 3/5 => 3/5 < 14/10`

`b,` Ta có:

`7/8 < 1 ; 5/2 >1`

`=> 7/8 < 5/2`

`c,` Ta có:

`15/7 >1 ; 8/64 <1`

`=> 15/7 > 8/64`

Answer 3

\(\dfrac{3}{5}< \dfrac{14}{10};\dfrac{7}{8}< \dfrac{5}{2};\dfrac{15}{7}>\dfrac{8}{64}\)

Answer 4

`3/5` giữ nguyên

`14/10 = 7/5`

mà `3 < 7`

Nên `3/5 < 7/5`

`=> 3/5 < 14/10`

_____________________________

`7/8` giữ nguyên

`5/2 = 20/8`

Mà `20 > 7`

Nên `7/8 < 20/8`

`=> 7/8 < 5/2`

__________________________

`8/64 = 1/8 = 7/56`

`15/7 = 120/56`

Mà `120 > 7`

Nên `7/56 <120/56`

`=> 8/64 < 15/7`

Answer 5

`3/5=3/5`

`14/10=7/5`

`=>3/5<14/10`

`7/8=7/8`

`5/2=20/8`

`=>7/8<5/2`

`15/7>1`

`8/64<1`

`=>15/7>8/64`

Answer 6

\(\dfrac{3}{5}=\dfrac{6}{10}< \dfrac{14}{10}\)

\(\dfrac{7}{8}< \dfrac{5}{2}=\dfrac{20}{8}\)

\(\dfrac{15}{7}=\dfrac{120}{56}>\dfrac{8}{64}=\dfrac{1}{8}=\dfrac{7}{56}\)

Answer 7

\(\dfrac{3}{5}\) và \(\dfrac{14}{10}\)

Giữ nguyên \(\dfrac{14}{10}\)

\(\dfrac{3}{5}=\dfrac{6}{10}\)

Vì \(\dfrac{6}{10}< \dfrac{14}{10}\) kết luận \(\dfrac{3}{5}< \dfrac{14}{10}\)

\(\dfrac{7}{8}\) và \(\dfrac{5}{2}\)

Giữ nguyên \(\dfrac{7}{8}\)

\(\dfrac{5}{2}=\dfrac{20}{8}\)

Vì \(\dfrac{7}{8}< \dfrac{20}{8}\) kết luận \(\dfrac{7}{8}< \dfrac{5}{2}\)

\(\dfrac{15}{7}\) và \(\dfrac{8}{64}\)

\(\dfrac{15}{7}=\dfrac{960}{448};\dfrac{8}{64}=\dfrac{56}{448}\)

Vì \(\dfrac{960}{448}>\dfrac{56}{448}\) kết luận \(\dfrac{15}{7}>\dfrac{8}{64}\)

Answer 8

Có \(\dfrac{3}{5}=\dfrac{6}{10}\Rightarrow\dfrac{3}{5}< \dfrac{14}{10}\)

Có \(\dfrac{5}{2}=\dfrac{20}{8}\Rightarrow\dfrac{5}{2}>\dfrac{7}{8}\)

Có \(\dfrac{8}{64}=\dfrac{1}{8}=\dfrac{7}{56};\dfrac{15}{7}=\dfrac{120}{56}\Rightarrow\dfrac{15}{7}>\dfrac{8}{64}\)

Answer 9

$a,\frac{3}{5}<1$

$\frac{14}{10}>1$

$Vậy\frac{3}{5}<\frac{14}{10}$

$b,\frac{7}{8}<1$

$\frac{5}{2}>1$

$Vậy\frac{7}{8}<\frac{5}{2}$

$c,\frac{15}{7}>1$

$\frac{8}{64}<1$

$Vậy\frac{15}{7}>\frac{8}{64}$.