nhiều quá bn oi...

bài thì dẽ nhưng nhiều

a) A=2019²⁰-129¹²

=...1-...1

=...0

=>A chia hết cho 10

\(\left|-28\right|+\left(129-182+99\right)-\left(129+199-182\right)\\ =28+129-182+99-129-199+182\\ =28+\left(129-129\right)+\left(182-182\right)+\left(99-199\right)\\ =28-100=-72\)

Ta có:

5 - ( 12 - x ) = 129 - ( 6 + 129 )

5 - 12 + x    = 129 - 6 - 129

 ( -7 ) + x     = ( -6)

            x      = ( - 6 ) + 7 

            x      = 1

Vậy x = 1 

5-(12-x)=129-(6+129)

5-(12-x)=129-135

5-(12-x)=-6

   12-x =5-(-6)

    12-x=11

         x=12-11

         x=1

\(-\left(-129\right)+\left(-129\right)-301+12\)

\(=0-301+12\)

\(=-301+12\)

\(=-289\)

Chúc bạn học tốt

-(-129)+(-129)-301+12

=129+(-129)-289

=-289

    /-28/ + (129 - 182 + 99) - (129 + 199 - 182)

= 28 + 129 - 182 + 99 - 129 - 199 + 182

= 129 - 129 + 182 - 182 + 99 - 199 + 28

= 0 + 0 + (-100) + 28

= -72

\(\left|-28\right|+\left(129-182+99\right)-\left(129+199-182\right)\)

\(=28+129-182+99-129-199+182\)

\(=28+129+\left(-182\right)+99+\left(-129\right)+\left(-199\right)+182\)

\(=\text{ }\left[129+\left(-129\right)\right]+\text{ }\left[\left(-182\right)+182\right]+\text{ }\left[99+\left(-199\right)\right]+28\)

\(=0+0+\left(-100\right)+28\)

\(=\left(-100\right)+28\)

\(=-72\)

59 + 64 = 36 + 63 + 59 _Sai_

129 + 157 - 29 =129 - 29 + 157 _Đúng_

129 + 157 - 29 = 157 + 129 - 29 _Đúng_

4 +16 x 25 = 16 + 4 x 25 _Sai_

21 + 49 : 7 = 49 + 21 : 7 _Sai_

(36 + 45 ) : 9 = (45+36 ) : 9 _Đúng_

(Cái này tính nhẩm là ra thôi bạn ạ! Đúng cho mình 1 tick nhé bạn!)

B=(-129.129).(-347.347).(-253.253)

B=0.0.0

B=0

sai thì thôi nha bạn ^^

thanks you

\(x=96-12=84.\)

\(x=96-12=84\)

\(x=98-78=20\)

\(x=69-27=42\)

\(x=85-20=65\)

\(x=129-85=44\)

\(x=201-129=72\)

\(x=98+129=227\)

96 - x = 12 

       x = 96 - 12 

       x = 84

78 + x = 98 

       x = 98 - 78

       x = 20

x + 27 = 69

       x = 69 - 27

       x = 42

x + 20 = 85

        x =  85 - 20 

        x =  65

x + 85 = 129

      x = 129 - 85

      x = 44

x + 129 = 201 

         x =  201 - 129

        x = 72 

x - 129 = 98 

        x = 129 - 98

        x = 31

k mình nha , Thank you ! 

Bài hát này là : Symphony bạn nhé!

I've been hearing symphonies
Before all I heard was silence
A rhapsody for you and me
And every melody is timeless
Life was stringing me along
Then you came and you cut me loose
Was solo singing on my own
Now I can't find the key without you