\(\text{a, 54 + (- 37 + 10 - 54 + 67)}.\)

\(=54-37+10-54+67=\left(54+54\right)+\left(-37+67\right)+10=30+10=40.\)

\(\text{b, - 2021 + (- 569) + (- 201) + (+ 469) + 301}.\)

\(=-2021-569-201+469+301=-2021+\left(-569+469\right)+\left(-201+301\right)=-2021-100+100=-2021.\)

3. 31-[26-(2017+35)]

=31-26-2017+35

=(31-26+35)-2017

=40-2017

=-1977

4. 54+(-37+10-54+67)

=54-37+10-54+67

=(54-54)-(37-67)+10

=0+30+10

=40

a) 54 + ( -37+ 10 -54 + 67)

=54-37+10-54+67

=(54-54)+(-37+67)+10

=30-10

=20

b) ( 326-43)+( 174-57)

=326-43+174-57

=(326+174)+(-43-57)

=500-100

=400

hok tốt

\(\text{a) 54 + ( -37+ 10 -54 + 67)}\)

\(=54+\left(-37\right)+10+\left(-54\right)+67)\)

\(=\left[54+-\left(54\right)\right]+\left[67+\left(-37\right)\right]+10\)

\(=0+40+10=50\)

\(\text{b) ( 326-43)+( 174-57)}\)

\(\text{=326-43+174-57}\)

\(=\left(326+174\right)-\left(43+57\right)\)

\(=500-100=400\)

a) 54 + ( -37+ 10 -54 + 67)

 =54+ (-37)+10-54+67

=54+(-54)+(10+67)+(-37)

=0+77+(-37)

=40

b) ( 326-43)+( 174-57)

=326-43+174-57

=(326+174)+(-43-57)

=500-100

=400

=-83 - 96= -179

[37+(-66)+(-54)]-[(-67)-(-37)-66]

= [37-66-54]-[(-67)+37-66]

=37-66-54+67-37+66

=(37-37)+[(-66)+66]+[(-54)+67]

=0+0+13

=13

[37+(-66)+(-54)]-[(-67)-(-37)-66]

= [37-66-54]-[(-67)+37-66]

=37-66-54+67-37+66

=(37-37)+[(-66)+66]+[(-54)+67]

=0+0+13

=13

:)))^^^

d. 54-54+67-37+10
=40

e. 326+174-43-57
=400

f. 351+149-875-125
=-500

a) (65+27-49) - ( 45+37-19)

= 65+27-49 - 45 -37+19

= (65-45)+ ( 27-37) + (-49+19)

= 20 + (-10) + (-30)

= -20

a)(84-69)+(39-44+20)

=84-69+39-44+20

=(84-44)+(-69+39)+20

=40-30+20=30

e)e.- (- 214 - 37) + (- 71 - 214) - (- 63 + 29)

=214+37-71-214+63-29

=(214-214)+(37+63)+(-71-29)

=0

a)215+((-38)-(-58))+(90-85)

215+20+5

(215+5)+20

220+20

240

b) (917-417)+65

500+65

565

a: =215-85-38+58+90

=130+90+20

=150+90=240

b: \(=917-417+65=500+65=565\)

c: \(=31-26+2017+38=2060\)

d: \(=54-37+10-54+67=10+30=40\)

e: \(=326-43+174-57=500-100=400\)