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1/(321-797-321+697)-371-(1900-371)=(-100)-371-1900+371=(-100)+100-1900=-1900
2/(-4625-164+4625+164)-(1907-2134-1907)=0-(-2134)=2134
3/17450-1685-17450+1865-14+147=(-1685+1865)+133=180+133=313
4/18950-271-18850+271-48+57=57-48=9
5/(2486-486)+(697-97)+58=2000+600+58=2658
1) 271 - [ - 43 - ( - 271 - 17 )]
= 271 - [ - 43 + 271 + 17 ]
=271+43-271-17
=43-17
=26
2) 6 - 24 - 24 + 48 + 4
=10+48-48
=10
1)\(217-\left[-43-\left(-271-17\right)\right]\\ =217-\left(-43+271+17\right)\\ =217+43-271-17\\ =43-17=26\)
2)\(6-24-24+48+4=6+4=10\)
a) $371+731-271-531$
$=(371-271)+(731-531)$
$=100+200$
$=300$
b) $57+58+59+60+61-17-18-19-20-21$
$=(57-17)+(58-18)+(59-19)+(60-20)+(61-21)$
$=40+40+40+40+40$
$=40\cdot5$
$=200$
c) $9-10+11-12+13-14+15-16$
$=(9-10)+(11-12)+(13-14)+(15-16)$
$=-1+(-1)+(-1)+(-1)$
$=-1\cdot4$
$=-4$
$\text{#}Toru$
a) \(\left(-48\right)+127+\left(-52\right)+73\)
\(=\left(-48-52\right)+\left(127+73\right)\)
\(=-100+200\)
\(=100\)
b) \(\left(-38\right)\cdot45+\left(-38\right)\cdot55\)
\(=\left(-38\right)\cdot\left(45+55\right)\)
\(=\left(-38\right)\cdot100\)
\(=-3800\)
c) \(\left(-125\right)+371+\left(-875\right)+629+150\)
\(=\left(-125-875\right)+\left(371+629\right)+150\)
\(=-1000+1000+150\)
\(=150\)
d) \(271+\left(-392\right)+729+\left(-608\right)+\left(-123\right)\)
\(=\left(271+729\right)+\left(-392-608\right)-123\)
\(=1000-1000-123\)
\(=-123\)
e) \(\left(-48\right)\cdot25+25\cdot\left(-52\right)\)
\(=25\cdot\left(-48-52\right)\)
\(=25\cdot-100\)
\(=-2500\)
f) \(47\cdot\left(-11\right)+47\)
\(=47\cdot\left(-11+1\right)\)
\(=47\cdot-10\)
\(=-470\)
g) \(56-7\cdot8+11\)
\(=56-56+11\)
\(=0+11\)
\(=11\)
h) \(-42+51+2+\left(-11\right)+40\)
\(=\left(-42+2\right)+\left(51-11\right)+40\)
\(=-40+40+40\)
\(=0+40\)
\(=40\)
a: =-48-52+127+73
=200-100
=100
b; \(=-38\left(45+55\right)=-38\cdot100=-3800\)
c: \(=-125-875+371+629+150\)
=-1000+1000+150
=150
d: =271+729-392-608-123
=1000-1000-123
=-123
e: =25(-48-52)
=25*(-100)
=-2500
f: =47(-11+1)
=47(-10)
=-470
g: =56-56+11
=11
h: =-42+2+51-11+40
=-40+40+40
=40
271 - [ ( -43 ) + 271 - ( -17 )
= 271 - [ -43 + 271 + 17 ]
= 271 + 43 - 271 - 17
= ( 271 - 271 ) + ( 43 - 17 )
= 0 + 26
= 26
= 271 + 43 - 271 - 17
= ( 271 - 271 ) + ( 43 -17 )
= 0 + 26
= 26
271-[(-43)+271-(-17)]
= 271 + 43 - 271 -17
= ( 271 - 271 ) + ( 43 - 17 )
= 0 + 26
= 26
-144-[29-(+144)-(+144)]
= - 144 - 29 + 144 + 144
= ( 144 - 144 ) + ( 144 - 29 )
= 0 + 115
= 115
a) Ta có: \(271-\left[\left(-43\right)+271-\left(-17\right)\right]\)
\(=271-\left(-43+271+17\right)\)
\(=271+43-271-17\)\(=43-17=26\)
b) Ta có: \(-144-\left[29-\left(+144\right)-\left(+144\right)\right]\)
\(=-144-\left[29-144-144\right]\)
\(=-144-29+144+144\)
\(=144-29=115\)
271-[(-43)+271-(-17)]
=271+43-271+17
=(271-271)+(43+17)
= 0 + 60
= 60
Tick nha!!! ^~^
\(18950+\left(-271\right)+\left(-18850\right)-\left(-271\right)+\left(-48\right)+57\)
\(=18950-271-18850+271-48+57\)
\(=\left(18950-18850\right)-\left(271-271\right)-48+57\)
\(=100-0-48+57\)
\(=52+57=109\)
=(18950-18850)-(271-271)-48+57
=100-0-48+57
=100-48+57
=52+57
=109