a) (-25)+72-80

=47-80

=-33

b) (-3) . 5 + 28 - (-15) 

=-15 +28+15

=(15-15)+28

=0+28

=28

c) (-42) : 7 + (-14) - (-3) . 4

=(-6)-14-(-12)

=-20+12

=-8 

d) 15 - 6 : (-3) + (-7) . (-2) 

=15-(-2)+14

=17+14

=21

đáp án bằng 0

Vì ta phân tích \(2^4\) bằng \(4^2\) nên khi ta trừ cho nhau =0

Mặt khác tất cả các số nhân với nhau bằng 0

\(\left(2^{17}+17^2\right).\left(9^{15}-3^{15}\right).\left(2^4-4^2\right)\\ =\left(2^{17}+17^2\right).\left(9^{15}-3^{15}\right).\left(16-16\right)\\ =\left(2^{17}+17^2\right).\left(9^{15}-3^{15}\right).0=0\)

`4/7 x -x=-9/14`

`=> 4/7 x - x . 1 =-9/14`

`=> (4/7-1) x=-9/14`

`=> -3/7 x=-9/14`

`=>x=-9/14 : (-3/7)`

`=>x=-9/14 xx (-7/3)`

`=>x=3/2`

a)\(=>x=\left(-\dfrac{1}{2}+\dfrac{1}{4}\right):2=-\dfrac{1}{8}\)

a) \(2x-\dfrac{1}{4}=\dfrac{-1}{2}\)

    \(2x=\dfrac{-1}{2}+\dfrac{1}{4}\)

   \(2x=-\dfrac{1}{4}\)

    \(x=-\dfrac{1}{4}\div2\)

    \(x=-\dfrac{1}{8}\)

b) \(\dfrac{13}{3}-\dfrac{1}{3}\cdot\left(x+1\right)=\dfrac{4}{3}\)

              \(\dfrac{1}{3}\cdot\left(x+1\right)=\dfrac{13}{3}-\dfrac{4}{3}\)         

              \(\dfrac{1}{3}\cdot\left(x+1\right)=3\)

                     \(x+1=3\div\dfrac{1}{3}\)

                    \(x+1=9\)

                   \(x=9-1\)

                   \(x=8\)

\(\left(x-2\right)^5-\left(x-2\right)^3=0\)

\(\Rightarrow\left(x-2\right)^3\left(\left(x-2\right)^2-1\right)=0\)

\(\Rightarrow\left[{}\begin{matrix}x-2=0\\\left(x-2\right)^2-1=0\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=2\\\left(x-2\right)^2=1\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=2\\x-2=1\\x-2=-1\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=2\\x=3\\x=1\end{matrix}\right.\)

Vậy \(x\in\left\{1;2;3\right\}\)

⇒ ( x - 2)³ . (x - 2)² - (x - 2)³  . 1 = 0                                                          ⇒ ( x - 2)³ . [( x - 2)² - 1] = 0 

khó quá ??????????????????????????????????

a) (-2) . ( x+7 ) + (-5) = 7 

<=>(-2).(x+7)=7+5

<=>x+7=12:(-2)

<=>x+7=-6

<=>x=(-6)-7

<=>x=-13

Vậy x=-13

b)(x+4) : (-7) = 14

<=>x+4=14 x (-7)

<=>x+4=-98

<=>x=-98-4

<=>x=-102

Vậy x= -102

c) 72 : ( x+5) - 4 = -12 

<=>72:(x+5)=(-12)+4

<=>x+5=72:(-8)

<=>x+5=-9

<=>x=-9-5

<=>x=-14

Vậy x= -14

d) (x+3) : (-6 ) + 12 = 8 

<=>(x+3) :(-6)=8-12

<=>x+3=(-4)x(-6)

<=>x+3=24

<=>x=24-3

<=>x=21

Vậy x= 21 

1) (-37) + 14 + 26 + 37

= [(-37) + 37] + 14 + 26

= 0 + 40

= 40

2) (-24) + 6 + 10 + 24

= [(-24) + 24] + 6 + 10

= 0 + 16

= 16

3) 15 + 23 + (-25) + (-23)

= 15 + (-25) + [(-23) + 23]

= -10 + 0

= -10

4) 60 + 33 + (-50) + (-33)

= 60 + (-50) + [(-33) + 33]

= 10 + 0

= 10

\(\Leftrightarrow x\in\varnothing\)

em cảm ơn ạ