Ta có: \(C=5\dfrac{9}{10}:\dfrac{3}{2}-\left(2\dfrac{1}{3}\cdot4\dfrac{1}{2}-2\cdot2\dfrac{1}{3}\right):\dfrac{7}{4}\)

\(=\dfrac{59}{10}\cdot\dfrac{2}{3}-\left(\dfrac{7}{3}\cdot\dfrac{9}{2}-2\cdot\dfrac{7}{3}\right):\dfrac{7}{4}\)

\(=\dfrac{59}{15}-\left(\dfrac{7}{3}\cdot\dfrac{5}{2}\right):\dfrac{7}{4}\)

\(=\dfrac{59}{15}-\dfrac{35}{6}\cdot\dfrac{4}{7}\)

\(=\dfrac{59}{15}-\dfrac{10}{3}\)

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

4:

a: =4/15-2,9+11/15=1-2,9=-1,9

b: \(=-36,75+3,7-63,25+6,3=10-100=-90\)

c: \(=6,5+3,5-\dfrac{10}{17}-\dfrac{7}{17}=10-1=9\)

d: \(=\dfrac{13}{25}\left(-39,1-60,9\right)=\dfrac{13}{25}\left(-100\right)=-52\)

e: =-5/12-7/12-3,7-6,3=-1-10=-11

f: =2,8(-6/13-7/13)-7,2=-2,8-7,2=-10

cậu tách ra từng bài thôi nha.

1&2/3 là gì zậy ta =)?

a) 5/3

b)51/35

7,004=7004/1000=7 4/1000

3=3/10=3/100=.....

5/8=0,625

Những câu khác bạn tự làm:

6m2 9dm2=609dm2>69dm2

7dm2 5cm2=705cm2<7500 cm2

Huhuhu!!

a) \(\frac{x}{9}=\frac{8}{6}\Rightarrow x=\frac{8}{6}.9=\frac{4}{3}.9=12\)

b) \(\frac{12}{x}=\frac{6}{7}\Rightarrow x=12:\frac{6}{7}=12.\frac{7}{6}=14\)

c) \(5\frac{2}{3}:x=3\frac{2}{3}-2\frac{1}{2}\Rightarrow\frac{17}{3}:x=\left(3-2\right)+\left(\frac{2}{3}-\frac{1}{2}\right)\)

\(\Rightarrow\frac{17}{3}:x=1+\frac{1}{6}=\frac{7}{6}\Rightarrow x=\frac{17}{3}:\frac{7}{6}=\frac{17}{3}.\frac{6}{7}=\frac{34}{7}\)

Thank you Thuý Ngân

`a)1<3`

`=>1/5<3/5`

`b)21>9`

`=>8/21<8/9`

`c)3/5<5/5=1`

`d)7/5>5/5=1`

a)3/5>1/5 b)8/21<8/9 c)3/5<1 d)7/5>1

a 1/5<3/5

b 8/21<8/9

c 3/5<1

d 7/5>1

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\(\dfrac{14}{8}:\dfrac{7}{12}-\dfrac{3}{8}:\dfrac{9}{5}\\ =\dfrac{7}{4}:\dfrac{7}{12}-\dfrac{3}{8}:\dfrac{9}{5}\\ =\dfrac{7}{4}\times\dfrac{12}{7}-\dfrac{3}{8}\times\dfrac{5}{9}\\ =\dfrac{12}{4}-\dfrac{1\times5}{8\times3}\\ =3-\dfrac{5}{24}\\ =\dfrac{3\times24-5}{24}\\ =\dfrac{72-5}{24}\\ =\dfrac{67}{24}\)

3

3

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