=(-257)-{-257+156-56}

=-257+257-156+56

=0+-156+56

=-100

(-257)-{(-257+156)-56}

<=> (-257)-(-101-56)

<=> (-257)-(-157)

<=> -100

(-257)-[(-257+156)-56]

=(-257)-(-257+156-56)

=(-257)-(-257+100)

=-257+257-100

=(-257+257)-100

=0-100

=-100

-100 do

 (-257)-[(-257+156)-56]

=(-257)+257+156-56

=[(-257)+257]+(156-56)

=0+100

=100

k cho mk nha b

-257 - [(-127 + 156)  - 56]

= -257 + 127 - 156 + 56

= - (257 - 127) - (156 - 56)

= - 130 - 100

= -  230 

-257 - [(-127 + 156) - 56]

= -257 - [-127 + 156 - 56]

= -257 - [-127 + 100]

= -257 + 27

= -230

-257 - [(-127 + 156)  - 56]

= -257 + 127 - 156 + 56

= - (257 - 127) - (156 - 56)

= - 130 - 100

= -  230 

-257 + 257 - 156 + 56 =0-156+56=-100

-257+257-156+56

=0-156+56

=-156+56

=-100

vi bam may tinh bo tui

( -2005) -[(- 257+156) -56]

= ( -2005 ) - [(-101) - 56 ]

= ( - 2005 ) - (-157 )

= -1848

(-2005)-[(-257+156)-56]

=(-2005)-[(-101)-56]

=(-2005)-(-157)

= -1848

( -2005) -[(- 257+156) -56 

= - 2005 - ( - 101 - 56 )

= - 2005 - (-157)

= - 1848

(-257)-[(-257+156)-56]=-257-[-257+156-56]=(-257+257)+(156-56)=0+100=100

(-257)-[(-257+156)-56]=(-257)-[(-257+(156-56)]=(-257)-(-257)+100=-257+257+100=0+100=100

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b)23.75+25.23+180

    23.(75+25)+180

    23.100+180

    2300+180

    2480

c)

-257-(-257)+100

     (-257+257)+100

     0+100

     100

d)

-3-4+6

-3+(-4)+6

-7+6

-1

a: \(-59+71-\left\{-83-\left(95\right)\right\}\)

\(=71-59+81+95\)

\(=12+81+95\)

\(=93+95=188\)

b: \(-257-\left\{\left(-257+156\right)-56\right\}\)

\(=-257-\left(-257+156-56\right)\)

\(=-257-\left(-257+100\right)\)

\(=-257+257-100=-100\)

c: Sửa đề:\(\left(435-167\right)-89-\left(435-89\right)\)

\(=435-167-89-435+89\)

=\(\left(435-435\right)+\left(-89+89\right)-167\)

=0+0-167

=-167

d: \(-329+\left(15-101\right)-\left(25-440\right)\)

\(=-329+15-101-25+440\)

\(=\left(440-329-101\right)+\left(15-25\right)\)

=10-10

=0

e: \(\left(116+124\right)+\left(215-116-124\right)\)

\(=116+124+215-116-124\)

\(=\left(116-116\right)+\left(124-124\right)+215\)

=0+0+215

=215

f: \(4524-\left(864-999\right)-\left(36-999\right)\)

\(=4524-864+999-36+999\)

\(=4524-\left(864+36\right)+999\cdot2\)

\(=4524-900+1998=5622\)