30x25x7x8

=(30x7)x(25x8)

=210x200

=42000

75x8x12x14

=(75x12)x(8x14)

=900x112

=100800

A) =(30*7)*(25*8)

=210*200

=4200 

B)=(75*8)*(12*14)

=600*168
=100800

Theo đề ra, ta có phân số \(\dfrac{999}{85}\)

Mà \(1=\dfrac{1\times85}{1\times85}=\dfrac{85}{85}< \dfrac{999}{85}\)

Vậy phân số cần tìm là \(\dfrac{999}{85}\) và nó lớn hơn 1.

\(174x1274-175x273-175\)

\(=221676-47775-175\)

\(=173726\)

173726 nhé bạn ê

`8/16=1/2`

`1<5-> 8/16<5/2`

`40/35= 8/7`

`8=8->40/35=8/7`

Ta có \(\dfrac{8}{10}=\dfrac{4}{5}\)

Vì 2 < 4 nên \(\dfrac{2}{5}< \dfrac{4}{5}=\dfrac{8}{10}\)

Vậy \(\dfrac{2}{5}< \dfrac{8}{10}\)

`6/12=(6:3)/(12:3)=2/4`

có `2<3` nên `2/4<3/4`

`=> 6/12<3/4`

1+1=?

4/10=2/5

1/5<2/5

ok bạn nhé

`2/3=(2xx10)/(3xx10)=20/30`

`3/5=(3xx6)/(5xx6)=18/30`

`7/10=(7xx3)/(10xx3)=21/30`

MSC: 30

\(\dfrac{2}{3}=\dfrac{2\times10}{3\times10}=\dfrac{20}{30}\) 

\(\dfrac{3}{5}=\dfrac{3\times6}{5\times6}=\dfrac{18}{30}\) 

\(\dfrac{7}{10}=\dfrac{7\times3}{10\times3}=\dfrac{21}{30}\)

a) 

\(\dfrac{6}{12}=\dfrac{6:6}{12:6}=\dfrac{1}{2}\)

\(\Rightarrow\dfrac{1}{2}=\dfrac{1\times2}{2\times2}=\dfrac{2}{4}\)

Mà \(\dfrac{2}{4}< \dfrac{3}{4}\)

Vậy \(\dfrac{6}{12}< \dfrac{3}{4}\).

b)

\(\dfrac{8}{10}=\dfrac{8:2}{10:2}=\dfrac{4}{5}\)

Mà \(\dfrac{2}{5}< \dfrac{4}{5}\)

Vậy \(\dfrac{2}{5}< \dfrac{8}{10}\).

c)

\(\dfrac{40}{35}=\dfrac{40:5}{35:5}=\dfrac{8}{7}\)

Mà \(\dfrac{8}{7}>\dfrac{6}{7}\)

Vậy \(\dfrac{40}{35}>\dfrac{6}{7}\).

d)

\(\dfrac{8}{16}=\dfrac{8:8}{16:8}=\dfrac{1}{2}\)

Mà \(\dfrac{1}{2}< \dfrac{5}{2}\)

Vậy \(\dfrac{8}{16}< \dfrac{5}{2}\).