54+(-37+10-54+67)
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\(\text{a, 54 + (- 37 + 10 - 54 + 67)}.\)
\(=54-37+10-54+67=\left(54+54\right)+\left(-37+67\right)+10=30+10=40.\)
\(\text{b, - 2021 + (- 569) + (- 201) + (+ 469) + 301}.\)
\(=-2021-569-201+469+301=-2021+\left(-569+469\right)+\left(-201+301\right)=-2021-100+100=-2021.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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
\(\text{a) 54 + ( -37+ 10 -54 + 67)}\)
\(=54+\left(-37\right)+10+\left(-54\right)+67)\)
\(=\left[54+-\left(54\right)\right]+\left[67+\left(-37\right)\right]+10\)
\(=0+40+10=50\)
\(\text{b) ( 326-43)+( 174-57)}\)
\(\text{=326-43+174-57}\)
\(=\left(326+174\right)-\left(43+57\right)\)
\(=500-100=400\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
d. 54-54+67-37+10
=40
e. 326+174-43-57
=400
f. 351+149-875-125
=-500
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (65+27-49) - ( 45+37-19)
= 65+27-49 - 45 -37+19
= (65-45)+ ( 27-37) + (-49+19)
= 20 + (-10) + (-30)
= -20
![](https://rs.olm.vn/images/avt/0.png?1311)
a)215+((-38)-(-58))+(90-85)
215+20+5
(215+5)+20
220+20
240
\(54+\left(-37+10-54+67\right)\)
\(=54-37+10-54+67\)
\(=\left(54-54\right)+\left(-37+67\right)+10\)
\(=0+30+10\)
\(=40\)
57+(-37+10-54+67)=54+(-14)=40