a,(38-129+43)-(43+38)=38-129+43-43-38=(38-38)+(43-43)-129=-129

b,-144-[29-(+144)-(-144)=-144-29+144-144=(144-144)-29-144=-173

c)48+|48-174|+(-74)=18+126-74=70

d)(-123+77)-(277-23-123)=-123+77-277+23+123=(-123+123)+(77-277)+23=-200+23=-177

e)-(-57-159)+(43-169)=57+129+43-169=(57+43)+(129-169)=100-40=60

Chúc bạn học tốt( sai chỗ nào cho mjk sr nka??) k cho  mjk nka

\(\left(38-29+43\right)-\left(43+38\right)\)

\(=38-29+43-43-38\)

\(=\left(38-38\right)+\left(43-43\right)-29\)

\(=0+0-29\)

\(=0-29\)

\(=-29\)

k thể tính, k mình nha

Bạn diệu linh bạn học cấp 1 trường nào, lớp nào

a,  2 17 + 17 2 9 15 - 3 15 2 4 - 4 2

=  2 17 + 17 2 9 15 - 3 15 16 - 16

=  2 17 + 17 2 9 15 - 3 15 . 0

= 0

b,  1 2 + 2 3 + 3 4 + 4 5 . ( 1 3 + 2 3 + 3 3 + 4 3 ) ( 3 8 - 81 2 )

=  1 2 + 2 3 + 3 4 + 4 5 . ( 1 3 + 2 3 + 3 3 + 4 3 ) ( 3 4 . 2 - 81 2 )

=  1 2 + 2 3 + 3 4 + 4 5 . ( 1 3 + 2 3 + 3 3 + 4 3 ) ( 81 2 - 81 2 )

=  1 2 + 2 3 + 3 4 + 4 5 . ( 1 3 + 2 3 + 3 3 + 4 3 ) . 0

= 0

c,  7 24 + 7 23 : 7 22

=  7 24 : 7 22 + 7 23 : 7 22

=  7 24 - 22 + 7 23 - 22

=  7 2 + 7 1

= 49 + 7 = 56

a)  − 105 + − 25 + ( − 105 ) + 50  

= 105 + 25 + ( - 105) + 50

= [105 + ( -105)] + ( 25 + 50 )

= 0 + 75 = 75

b)  465 + − 38 + − 465 − 12 − − 42

= 465 + ( - 38) + ( -465) – 12 – 42

= [ 465 + (- 465) ] – ( 12 + 42 )

= 0 – 54 = 0 + ( -54 ) = -54

c)  65. − 19 + − 19 .24 + − 19 .11

= ( - 19) . ( 65 + 24 + 11 )

= ( -19) . 100 = -1900

d)  − 3 2 + 2 3 − − 5 2 + 4 3

= 9 + 8 – 25 + 64 = 56

a: Ta có: \(\left(2^{17}+17^2\right)\cdot\left(9^{15}-3^{15}\right)\cdot\left(2^4-4^2\right)\)

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

=0

b: Ta có: \(\dfrac{8^{2017}-8^{2015}}{8^{2104}\cdot8}\)

\(=\dfrac{8^{2015}\cdot\left(8^2-1\right)}{8^{2105}}\)

\(=\dfrac{1\cdot63}{8^{90}}\)+

c: Ta có: \(\left(1^3+2^3+3^4+4^5\right)\cdot\left(1^3+2^3+3^3+4^3\right)\cdot\left(3^8-81^2\right)\)

\(=\left(1^3+2^3+3^4+4^5\right)\cdot\left(1^3+2^3+3^3+4^3\right)\cdot\left(3^8-3^8\right)\)

=0

d: Ta có: \(\left(2^8+8^3\right):\left(2^5\cdot2^3\right)\)

\(=\dfrac{2^8+2^9}{2^8}\)

=3

a)=115+30=145

b)=10-22=-12

c)=52-81=-29

d)=10+10+10+10=40

a)145

b)-12

c)-29

d)70
             Nhớ Tich cho mình nha.....thank you!!!!!!!!!

a, ( 1/2 - 13/14 ) : 5/7 - ( -2/21 + 1/7 ) : 5/7

= ( 7/14 - 13/14 ) : 5/7 - ( -2/21 + 3/21 ) : 5/7

= -3/7 : 5/7 - 1/21 : 5/7

= -3/7 . 7/5 - 1/21 . 7/5

= ( -3/7 - 1/21 ) . 7/5

= ( -9/7+ -1/21 ) . 7/5

= -10/21 . 7/5

= -2/3

b, (68/5 + 19/4 ) - 43/5

= 68/5 + 19/4 - 43/5

= ( 68/5 - 43/5 ) + 19/4

= 5 +19/4

= 39/4

c, ( 93/11 + 29/8 ) - 38/11

= 93/11 + 29/8 - 38/11

= ( 93/11 - 38/11 ) + 29/8

= 5 + 29/8

=69/8

d, 4/9 : ( -1/7 ) + 59/9 : ( -1/7 )

= 4/9 . -7 + 59/9 . -7

= ( 4/9 + 59/9 ) . -7

= 7 . -7

= -49

a)  19 5 8 : 7 12 − 15 1 4 : 7 12 = 19 5 8 − 15 1 4 : 7 12 = 19 5 8 − 15 2 8 : 7 12 = 4 3 8 . 12 7 = 15 2

b)  1 2 3 + 25 % − 1 2 : 3 8    = 5 3 + 1 4 − 1 2 : 3 8 = 5 3 + − 1 4 . 8 3 = 5 3 + − 2 3 = 1