x=-36

x=11

x=100

x=14

x=-36

x=11

x=100

x=14

2: \(\Leftrightarrow\left(\dfrac{x+1}{12}-1\right)+\left(\dfrac{x+2}{13}-1\right)=\left(\dfrac{x+3}{14}-1\right)+\left(\dfrac{x+4}{15}-1\right)\)

=>x-11=0

=>x=11

3: \(\Leftrightarrow\left(\dfrac{x-85}{15}-1\right)+\left(\dfrac{x-74}{13}-2\right)+\left(\dfrac{x-67}{11}-3\right)+\left(\dfrac{x-64}{9}-4\right)=0\)

=>x-100=0

=>x=100

 ( 12 x 13 + 14 x 15 + ... + 24 x 25 + 26 x 27 ) x ( 14 + 6 - 10 + 5 - 3 x 5 )

=  ( 12 x 13 + 14 x 15 + ... + 24 x 25 + 26 x 27 ) x 0

= 0

\(83\times14+27\times17+83\times13\)

\(=83\times\left(14+13\right)+27\times17\)

\(=83\times27+27\times17\)

\(=\left(83+17\right)\times27\)

\(=100\times27\)

\(=2700\)

Chúc bạn học tốt

$83\times 14+27\times 17+83\times 13$

$=83\times \left(14+13\right)+27\times 17$

$=83\times 27+27\times 17$

$=\left(83+17\right)\times 27$

$=100\times 27$

$=2700$

Chúc bạn học tốt

$83\times 14+27\times 17+83\times 13$

$=83\times \left(14+13\right)+27\times 17$

$=83\times 27+27\times 17$

$=\left(83+17\right)\times 27$

$=100\times 27$

$=2700$

Chúc bạn học tốt

    \(\dfrac{5}{13}\) \(\times\) \(\dfrac{9}{14}\) \(\times\) \(\dfrac{28}{27}\) \(\times\) \(\dfrac{26}{35}\)

=  \(\dfrac{5}{13}\) \(\times\) \(\dfrac{9}{14}\) \(\times\) \(\dfrac{14\times2}{9\times3}\) \(\times\) \(\dfrac{13\times2}{5\times7}\)

= \(\dfrac{5\times9\times14\times13}{5\times9\times14\times13}\) \(\times\) \(\dfrac{2\times2}{3\times7}\)

= 1 \(\times\) \(\dfrac{4}{21}\)

=  \(\dfrac{4}{21}\)

1: =-2/9(15/17+2/17)=-2/9

2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)

=-2-7/30=-67/30

3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)

=21/20+27/14=417/140

4: =-25/13(5/19+14/19)=-25/13

5: =-7/5-45/21=-7/5-15/7=-124/35

1: =-2/9(15/17+2/17)=-2/9

2: =34⋅75+97⋅32=34⋅75+97⋅32

=21/20+27/14=417/140

4: =-25/13(5/19+14/19)=-25/13

5: =-7/5-45/21=-7/5-15/7=-124/35

41 / 27 x 13 / 18 - 13 / 18 x 14 / 27 =  ( 41 / 27 - 14 / 27 ) x 13 / 18 = 27 / 27 x 13 / 18 = 1 x 13 / 18 = 13 / 18

hello

không biết

Cac so nguyen x la:-13;-12;-11;,,,;-1;0;1;...;24;25;26

Vi x la so nguyen, x chia het cho 13 va -14<x<27 nen x={-13;0;13;26}

Vay, x={-13;0;13;26}

Cảm ơn nha

cũng đúng

5 + ( x + 27 ) = 64

a) \(\Rightarrow x+27=59\Rightarrow x=32\)

b) \(\Rightarrow x-2=39\Rightarrow x=41\)

c) \(\Rightarrow x+5=-322\Rightarrow x=-327\)

d) \(\Rightarrow5x=35\Rightarrow x=7\)

e) \(\Rightarrow4\left(x-5\right)=56\Rightarrow x-5=14\Rightarrow x=19\)

f) \(\Rightarrow15+x=37\Rightarrow x=22\)

g) \(\Rightarrow7\left(13-x\right)=35\Rightarrow13-x=5\Rightarrow x=8\)

h) \(\Rightarrow10\left(x+1\right)=100\Rightarrow x+1=10\Rightarrow x=9\)