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\(\left(27+55\right)+\left(345-27-55\right)\)
\(=27+55+345-27-55\)
\(=\left(27-27\right)+\left(55-55\right)+345\)
\(=0+0+345\)
\(=345\)
\(38.65+38.50-38.15\)
\(=38.\left(65+50-15\right)\)
\(=38.100\)
\(=3800\)
\(\left(123-60\right)-\left(2017-60+123\right)\)
\(=123-60-2017+60-123\)
\(=\left(123-123\right)-\left(60-60\right)-2017\)
\(=0-0-2017\)
\(=-2017\)
Bỏ dấu ngoặc rồi tính:
(27 + 55 ) + ( 345 - 27 - 55 )
= 27 + 55 + 345 - 27 - 55
= (27-27) + (55-55) + 345
= 0 + 0 + 345
= 345
Tính nhanh:
38.65 + 38.50 - 38.15
= 38.(65+50-15)
= 38.100
= 3800
Bỏ ngoặc rồi tính:
( 123 - 60 ) - ( 2017 - 60 + 123 )
= 123 - 60 - 2017 + 60 - 123
= (123-123) + (60-60) - 2017
= 0 + 0 - 2017
= 0 - 2017
= -2017
![](https://rs.olm.vn/images/avt/0.png?1311)
|-127| - (217 + 627) + |2017|
= 127 - 217 - 627 + 2017
= -90 - 627 + 2017
= -717 + 2017
= 1300
Chúc bạn học tốt!
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a,= 2016-2017-2016+35+2017
=(2016-2016)+(2017-2017)+35
=0+0+35
=35
b,=1234-345+29-1234-135+59
=(1234-1234)-(345-135)+(29+59)
=0-210+88
=-122
c,=407+238-407-138+32
=(407-407)+(238-138)+32
=0+100+32
=132
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\(\left(-2017\right)-\left(2-2017\right)-\left[-28-\left(-2020\right)\right]\)
= \(-2017-2+2017-\left(-28+2020\right)\)
\(=-2017-2+2017+28-2020\)
\(=-2+28-2020\)
\(=-1994\)
Chúc bạn hok tốt!!! nguyễn anh thư
= -2017 - 2 +2017 + 28 + 2020
= - 2017 + 2017 -2 + 28 + 2020
= 0 -2 + 28 + 2020
= 26 + 2020
= 2046
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![](https://rs.olm.vn/images/avt/0.png?1311)
a) nếu trong 1 biểu thức toàn cộng và trừ hay toàn nhân và chia trong đó có dấu ngoặc thì khi bỏ ngoặc , nếu trước ngoặc có dấu cộng hay nhân thì ta giữ nguyên dấu trong ngoặc, nếu trước ngoặc có dấy trừ thì ta phải đổi tất cả dấu trong ngoặc
b) \(\left(2017-154+36\right)-\left(6-154+30\right)\)
\(=2017-154+36-6+154-30\)
\(=2017+\left(-154\right)+36+\left(-6\right)+154+\left(-30\right)\)
\(=2017+\text{ }\left[\left(-154\right)+154\right]+\left[36+\left(-6\right)\right]+\left(-30\right)\)
\(=2017+0+30+\left(-30\right)\)
\(=2017+\text{ }\left[30+\left(-30\right)\right]\)
\(=2017+0\)
\(=2017\)
(2017 - 154 + 36) - (6 -154 + 30).
= 2017 - 154 +36 - 6 + 154 - 30
= - 154 + 154 + 2017 - 30 + 36 - 6
= 0 + 1987 + 30
= 2017
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a) \(-\left(76-35+15\right)+\left[18-27+\left(-17\right)\right]\)
\(=-76+35+15+18-27-17\)
\(=-52\)
b) \(167+\left[127-235-\left(-16\right)\right]+\left(-67\right)\)
\(=167+127-235+16-67\)
\(=8\)
c) \(\left(-19\right)+165-\left[27+\left(-21\right)-\left(+72\right)\right]\)
\(=\left(-19\right)+165-27+21+72\)
\(=212\)
d) \(89.\left(-2\right)+\left[20+\left(-2\right).\left(-5\right)-85\right]\)
\(=\left(-178\right)+\left(20+10-85\right)\)
\(=\left(-178\right)+20+10-85\)
\(=-233\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, (- 40 - 16 + 32 ) + ( 40 + 116 - 32 )
=( - 40 )- 16 + 32 + 40 + 116 - 32
=[(-40)+40]+32-32+116-16
=0+ (32-32)+(116-16)
=0+0+100
=100
b, -15 + 5 + ( 20 - 100 - 2017 ) - ( - 15 - 2017 )
= -15 + 5 + 20 - 100 - 2017 + 15 + 2017
=[(-15 )+ 15] + (2017 - 2017 ) + 20-100
=0+0+(20-100)
= - 80
![](https://rs.olm.vn/images/avt/0.png?1311)
a) -(2015+2016)+(2015+2017)= -2015-2016+2015+2017= (2015-2015)+(2017-2016)= 0+1=1 b) -(16-17)+(-34-17)= -16+17-34-17=(17-17)-(-34-16)=0+(34+16)=0+50=50 c) (-37+17)-(-37-23)-40= -37+17+37+23-40=(37-37)+(17+23)-40= 0+40-40=0 tick mk
a) -2015 - 2016 + 2015 + 2017=( -2015 +2015 ) + ( -2016 +2017 )
= 0 + 1
= 1
b) -16 + 17 - 34 - 17= ( - 16 - 34 ) + ( 17 - 17 )
= - 50 + 0
= -50
c) -37 + 17 + 37 + 23 - 40 = ( -37 + 37 ) + ( 17 + 23 ) - 40
= 0 + 40 - 40
= 0
(-127)-(2017+627)+(2017)
=-127-2017-627+2017
=-127+(-2017)+(-627)+2017
=[-127+(-627)]+(-2017+2017)
=-754+0
=-754.
(-127)-(2017+627)+(2017)
= -127 - 2017 + 627 + 2017
= (-2017 + 2017) + (-127+627)
= 0 + 500
=500