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\(=\dfrac{5}{13}\cdot\dfrac{3}{10}\cdot\dfrac{13}{5}=\dfrac{3}{10}\)

10 tháng 2 2022

\(\dfrac{3}{10}\)

18 tháng 12 2022

=>125(3x+2):13=1000:13

=>125(3x+2)=1000

=>3x+2=8

=>x=2

\(a,\frac{-1}{9}.\frac{15}{22}.\frac{-9}{25}\)

\(=\frac{-1.15.\left(-9\right)}{9.22.25}\)

\(=\frac{3}{110}\)

\(b,\frac{-2}{7}.\left(\frac{5}{13}-\frac{9}{15}\right)-\frac{2}{7}.\frac{8}{13}\)

\(=\frac{-2}{7}.\left(\frac{5}{13}+\frac{8}{13}-\frac{3}{5}\right)\)

\(=\frac{-2}{7}.\left(1-\frac{3}{5}\right)\)

\(=\frac{-2}{7}.\frac{2}{5}\)

\(=\frac{-4}{35}\)

\(c,\frac{3}{10}.\left(\frac{-4}{9}+\frac{2}{5}\right)-\frac{3}{10}.\left(\frac{5}{9}-\frac{3}{5}\right)\)

\(=\frac{3}{10}.\left[\left(\frac{-4}{9}+\frac{2}{5}\right)-\left(\frac{5}{9}-\frac{3}{5}\right)\right]\)

\(=\frac{3}{10}.\left(\frac{-4}{9}+\frac{2}{5}-\frac{5}{9}+\frac{3}{5}\right)\)

\(=\frac{3}{10}.\left[\left(\frac{-4}{9}-\frac{5}{9}\right)+\left(\frac{2}{5}+\frac{3}{5}\right)\right]\)

\(=\frac{3}{10}.\left(-1+1\right)\)

\(=\frac{3}{10}.0\)

\(=0\)

\(d,\frac{4}{11}-\frac{5}{13}+\frac{7}{11}-\frac{8}{13}\)

\(=\left(\frac{4}{11}+\frac{7}{11}\right)+\left(\frac{-5}{13}-\frac{8}{13}\right)\)

\(=1-1\)

\(=0\)

Học tốt

19 tháng 11 2016

\(5^3\left(3x+2\right)\div13=10^3\div\left(13^5\div13^4\right)\)

\(\Rightarrow125\left(3x+2\right)\div13=1000\div13\)

\(\Rightarrow125\left(3x+2\right)=1000\)

\(\Rightarrow3x+2=1000\div125\)

\(\Rightarrow3x+2=8\)

\(\Rightarrow3x=8-2\)

\(\Rightarrow3x=6\Rightarrow x=6\div3\Rightarrow x=2\)

Vậy : x = 2

a: =-5/9-4/9+8/15+7/15-2/11=-2/11

b: =10/17+7/17-5/13-8/13+11/25

=11/25

c: =(9/12-2/12)*3/2=7/12*3/2=21/24=7/8

d: =(31/10-25/10)*3-2

=3/5*3-2

=9/5-2

=-1/5

14 tháng 2 2023

\(\dfrac{5}{13}.\dfrac{-3}{10}.\dfrac{-13}{5}\)
\(=\dfrac{5.3.13}{13.10.5}\)
\(=\dfrac{3}{10}\)

14 tháng 2 2023

\(\dfrac{5}{13}.\dfrac{-3}{10}.\dfrac{-13}{5}\)

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

14 tháng 2 2023

\(\dfrac{5}{13}.-\dfrac{3}{10}.-\dfrac{13}{5}\)
\(=\dfrac{5.3.13}{13.10.5}\)
\(=\dfrac{3}{10}\)

14 tháng 2 2023

\(\dfrac{5}{13}.\dfrac{-3}{10}.\dfrac{-13}{5}\\ =\dfrac{5}{13}.\left(\dfrac{-13}{5}\right).\dfrac{-3}{10}\\ =-1.\dfrac{-3}{10}\\ =\dfrac{3}{10}\)

13 tháng 10 2019

\(5^3.\left(3x+2\right):13=10^3:\left(13^5:13^4\right)\)

\(125.\left(3x+2\right):13=1000:13\)

\(125.\left(3x+2\right)=1000\)

\(3x+2=1000:125\)

\(3x+2=8\)

         \(3x=6\)

            \(x=2\)

Hok tốt nha^^

13 tháng 10 2019

=>53.(3x+2):13=103: 13

=>53.(3x+2)=103

=>(3x+2)=53

=>3x+2=5

=>3x=3

=>x=3:3

=>x=1

16 tháng 4 2023

a)  5/17 * 8/-7+8/17*-7/3+-7/3*4/17

-40/119 + 12/17 × -7/3

-40/119 + -28/17 =-236/119

b) -10/13 + 5/17 - 3/13 + 12/17 - 11/20

(5/17+12/17)-(10/13+3/13)-11/20

-11/20

17 tháng 4 2023

a)  5/17 * 8/-7+8/17*-7/3+-7/3*4/17

-40/119 + 12/17 × -7/3

-40/119 + -28/17 =-236/119

b) -10/13 + 5/17 - 3/13 + 12/17 - 11/20

(5/17+12/17)-(10/13+3/13)-11/20

-11/20