(55+45+15) - (15-55+45) = (100+15) - (-40+45)

                                    = 115 - 5

                                   =110

\(\left(55+45+15\right)-\left(15-55+45\right)\)

\(=55+45+15-15+55-45\)

\(=55+55\)

\(=110\)

bằng 110

(55+45+15)-(15-55+45)

=55+45+15-15+55-45

=(15-15)+(45-45)+(55+55)

=110

bằng 0 đúng rồi bạn

= 0 phải hk m.n

(55 + 45 +15) - (-15 - 55 + 45) = 0

57-725-605+53=-1220

55+45+15-15+55-45=110

Ủng hộ mk nhaaa

Câu 1:

= 57 - 725 - 605 - 53

=  ( 725 - 605 ) - ( 57 - 53 )

= 120 - 4

= 116

Câu 2 làm tương tự

sơ ry mk mới học lớp 5

\(1,=38-42+14-25+27+15=27\)

\(2,=12+21-23+21-10=21\)

\(3,=57-725-605+53=-1220\)

\(4,=55+45+15-15+55-45=110\)

\(\text{1.(38-42+14)-(25-27-15)}\\ =38-42+14-25+27+15\\ =-4-11+42\\ =27\)

\(\text{2.(12+21)-(23-21+10)}\\ =12+21-23+21-10\\ =33+44-10=67\)

1) -1

2) -1326

3) 90

a) ( 12 + 21 - 23 ) - ( 23 - 21 + 10 )

  = 12 + 21 - 23 - 23 - 21 + 10

  = ( 12 + 10 ) - ( 21 - 21 ) - ( 23 - 23 )

  =        22      -        0        -        0

  =                          22

b) ( 55 + 45 + 15 ) - ( 15 - 55 + 45 )

  = 55 + 45 + 15 - 15 - 55 + 45

  = ( 55 + 45 ) + ( 55 + 45 ) + ( 15 - 15)

  =       100      +      100      +      0

  =                          200

\(a)\)\(-\left(12+21-23\right)-\left(23-21+10\right)\)

 \(=-12-21+23-23+21-10\)

 \(=\left(-21+21\right)+23-23-12-10\)

 \(=0+0-12-10\)

 \(=-22\)

\(b)\)\(\left(55+45+15\right)-\left(15-55+45\right)\)

  \(=55+45+15-15+55-45\)

  \(=\left(15-15\right)+\left(45-45\right)+55+55\)

  \(=0+0+55+55\)

  \(=110\)

a) = 22

b) =200

a, (57-7250) + ( 605-53) = 57 - 7250 + 605 - 53 = - 6641

b, (55 + 45 + 15) - (15-55+45) = 55 + 45 + 15 - 15 + 55 - 45 = 110

c, (15 + 37) + (52-37-17) = 15+37+52-37-17= 50

Xong rồi đó k cho mk nha bn