a,7

b,80

a) 2575 + 37 - 2576 - 39

= 2576 + 36 - 2576 - 29

= 36 - 29

= 7

b) 34 + 35 + 36 + 37 - 14 - 15 - 16 - 17

= (34 - 14) + (35 - 15) + (36 - 16) + (37 - 17)

= 20 + 20 + 20 + 20

= 20 . 4

= 80

a)\(2575+37-2576-29=\left(2575-2576\right)+\left(37-29\right)=-1+9=8\)

b)\(34+35+36+37-14-15-16-17\)

\(=\left(34-14\right)+\left(35-15\right)+\left(36-16\right)+\left(37-17\right)\)

\(=20+20+20+20+20\)

\(=20.5\)

\(=100\)

a) 2575 + 37 - 2576 - 29

= ( 2575 - 2576 ) - 29 + 37

= -1 - 29 + 37

= -30 + 37 =7

b) 34 + 35 + 36 + 37 - 14 - 15 - 16 - 17

= ( 34 - 14 ) + ( 35 - 15 ) + ( 36 - 16 ) + ( 37 - 17 )

= 20  + 20 + 20 + 20

=80

a) 2575+37-2576-29=(2575+2576)-29+37=-1-29+37=-30+37=7

b)34+35+36+37-14-15-16-17=(34-14)+(35-15)+(36-16)+(37-17)=20+20+20+20=80

X

a,2575+37-2576-29=37+[(2575-2576)-29]=37+(-30)=7

b,34+35+36+37-14-15-16-17=(34-14)+(35-15)+(36-16)+(37-17)=20+20+20+20=80

2575+37-2576-29=(2575-2576)+(37-29)=-1+8=8-1=7

34+35+36+37-14-15-16-17=(34-14)+(35-15)+(36-16)+(37-17)=20+20+20+20=20.4=80

k cho mình nhá

a/2575+37-2576-29

= (2575-2576)+(37-29)

= -1+8

= 7

b/34+35+36+37-14-15-16-17

=(34-14)+(35-15)+(36-16)+(37-17)

=20+20+20+20

=80

a ) 2575 + 37 - 2476 - 29

 = (2575 - 2476 ) +( 37 - 29)

 = {(2575 + 24) -( 2476 + 24)} + {37 + 1 ) -( 29 +1)}

 = ( 2599 - 2500 )+ (38 - 30)

 = 99 + 8 =107

b)34 +35 +36+37 - 14 -15 -16-17

 = (34 -14) + ( 35 -15 )+ (36 -16) +(37 -17)= 20 * 4= 80. [ Tích cho tui nha ! ]

sao mình thấy nó hơi rắc rối

a)(-12)+(-13)+36+(-1)

={[(-12)+(-1)]+(-13)}+36

={(-13)+(-13)}+36

=(-26)+36

=10

b)25+37-48-25-37

=[25+(-25)]+(37-37)-48

=0+0-48

=0-48

=-48

c)2575+37-2576-29

=(2575-2576)+(37-29)

=(-1)+8

=7

d)34+35+36+37-14-15-16-17

=(34-14)+(35-15)+(36-16)+(37-17)

=10+10+10+10

=10.4

=40

*Lưu ý:Dấu . là dấu x

a/ (-12)+(-13)+36+(-1)

=(-12)+(-13)+(-1)+36

=(-26)+36

=10

b/ 25+37-48-25-37

=(25-25)+(37-37)-48

=0+0-48

=-48

c/ 2575+37-2576-29

=2575-2576+37-29

=(-1)+8

=-7

tick cho mình tròn 510 nha

Câu 1:

a,   |a+3|=7

\(\Rightarrow\orbr{\begin{cases}a+3=7\\a+3=-7\end{cases}}\Rightarrow\orbr{\begin{cases}a=4\\a=-11\end{cases}}\)

Vậy \(a\in\left\{4;-11\right\}\)

b.    |a+5|=-5+8

 \(\Rightarrow\left|a+5\right|=3\)

\(\Rightarrow\orbr{\begin{cases}a+5=3\\a+5=-3\end{cases}}\Rightarrow\orbr{\begin{cases}a=-2\\a=-8\end{cases}}\)

Vậy \(a\in\left\{-2;-8\right\}\)

Câu 2:  a, 2575+37-2576-29                                             

              =(2575-2576)+(37-29)

              =-1+8=7

b,     34+35+36+37-14-15-16-17

    =(34-14)+(35-15)+(36-16)+(37-17)

  =20+20+20+20=20.4=80

Học tốt

17.(29-(-111))+29.(-17)

=17⋅(29+111)+(−17)⋅29

=17⋅140−17⋅29

=17(140-29)

=17.111

=1887

17.[29 - (-111)] + 29.(-17)

= 17.29 + 17.111 + 29.(-17)

= (17.29 - 29.17) + 17.111

= 0 + 1887

= 1887