\(\text{14-(-15)-21}\)

\(=14+15-21\)

\(=29-21\)

\(=8\)

\(321+\left\{-15+\left[30+\left(-321\right)\right]\right\}\)

\(=321+\left(-15\right)+30+\left(-321\right)\)

\(=\left(321+\left(-321\right)\right)+\left(\left(-15\right)+30\right)\)

\(=0+15\)

\(=15\)

\(\text{(2016+432)+[168+(-2016)]}\)

\(=2016+432+168+\left(-2016\right)\)

\(=\left[2016+\left(-2016\right)\right]+\left(432+168\right)\)

\(=0+600\)

\(=600\)

học tốt

a.-234

b.-167

c.657

a=-234

b=-167

c=657

\(a.\left(-2009\right)-\left(234-2009\right)\\ =-2009-234+2009\\ =\left(-2009+2009\right)-234\\ =0-234\\ =-234\)

\(b.\left(134-167+45\right)-\left(134+45\right)\\ =134-167+45-134-45\\ =\left(134-134\right)+\left(45-45\right)-167\\ =0+0-167\\ =0-167\\ =-167\)

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

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

a)=500

a, (1267-196)-(267+304)

= 1267-196-267-304

= (1267-267)-(196+304)

= 1000-500

 = 500

b, 321+{-15+[30+(-321)]}

=321+{-15+30-321}

=321-15+30-321

=(321-321)+(-15+30)

=0+15

=15

c, \(19\cdot25\cdot25\cdot81+100\)

\(=961875+100\)

\(=961975\)

a) 15

b) 600

giải luôn giúp mình được không?

a)

= 321 + { ( -15) + (-291)}

= 321 + (-306)

= 15

b)

= (2016 + 432) + (-1848)

= 2448 + (-1848)

= 600

a)

-11

B)

-566

đáp án nha bạn

kết quả = 5007 nha

đáp án : 5007

= 5007