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[(321 - 797) + (-321 + 697)] - 371 - [1900 + (-371)]
= [321 - 797 - 321 + 697] - 371 - 1900 + 371
= [321 - 321 - 797 + 697] - 371 + 371 - 1900
= -100 - 1900
= -2000.
Học tốt.
\(\left[\left(321-797\right)+\left(-321+697\right)\right]-371-\left[1900+\left(-371\right)\right]\)
\(=321-797-321+697-371-1900-371\)
\(=\left(321-321\right)-\left(797-697\right)-\left(371-371\right)-1900\)
\(=0-100-0-1900\)
\(=-100-1900\)
\(=-2000\)
321 + { -15 + [ 30 + (-321) ] }
= 321 + { -15 + [ 30 - 321 ] }
= 321 + { -15 + 30 - 321 }
= 321 - 15 + 30 - 321
= (321 - 321) - (15 - 30)
= 0 - (-15)
= 15
(2016 + 432) + [168 + (-2016) ]
= 2016 + 432 + [ 168 - 2016 ]
= 2016 + 432 + 168 - 2016
= (2016 - 2016) + (432 + 168)
= 0 + 600
= 600
minh khong biet dau minh chi moi lop 5 thoi
chuc ban nam moi vui ve
thank you very much
\(\text{14-(-15)-21}\)
\(=14+15-21\)
\(=29-21\)
\(=8\)
\(321+\left\{-15+\left[30+\left(-321\right)\right]\right\}\)
\(=321+\left(-15\right)+30+\left(-321\right)\)
\(=\left(321+\left(-321\right)\right)+\left(\left(-15\right)+30\right)\)
\(=0+15\)
\(=15\)
\(\text{(2016+432)+[168+(-2016)]}\)
\(=2016+432+168+\left(-2016\right)\)
\(=\left[2016+\left(-2016\right)\right]+\left(432+168\right)\)
\(=0+600\)
\(=600\)
học tốt
a)=321+15+30+(-321)
=[321+(-321)]+(15+30)
=0+45=45
b)=2016+432+168+(-2016)
=[2016+(-2016)]+(432+168)
=0+600=600
a)321+{15+[30+(-321)]}=[321+(-321)]+(15+30)=0+45=45
b)(2016+432)+[168+(-2016)]=[2016+(-2016)]+(432+168)=0+600=600
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
172 - ( 36+172)
=172 - 36 -172
= ( 172-172)-36
=-36
( 170+25)-170
= 170 + 25 -170
= ( 170-170)+25
= 25