\(\text{a) }\left(27+514\right)-\left(486-73\right)\)

\(=27+514-486+73\)

\(=\left(27+73\right)+\left(514-486\right)\)

\(=100+1000\)

\(=1100\)

\(\text{b) }\left(38-29+43\right)-\left(43+28\right)\)

\(=38-29+43-43-28\)

\(=\left(38-28\right)+\left(43-43\right)-29\)

\(=10+0-29\)

\(=10-29\)

\(=-19\)

\(\text{c) }\left(-245-12\right)-\left(18-245\right)\)

\(=-245-12-18+245\)

\(=\left(245-245\right)-\left(12+18\right)\)

\(=0-30\)

\(=-30\)

\(\text{d) }\left(327+414\right)-\left(-586-73\right)\)

\(=327+414+586+73\)

\(=\left(327+73\right)+\left(414+586\right)\)

\(=400+1000\)

\(=1400\)

a)  (27+514)-(486-73)

= 27 + 514 - 486 + 73

= ( 27+ 73 ) + ( 514 - 486 )

= 100 + 1000

= 1100
 

a,(17-414)-(586-83)

=17-414-586+83

=(17+83)+(-414-586)

=100+(-1000)

=-900

b,29.(-13)+27.(-29)+(-140).(-29)

=(-29).(-1).(-13)+27.(-29)+(-140).(-29)

=(-29).13+27.(-29)+(-140).(-29)

=(-29).(13+27-140)

=(-29).(-100)

=2900

53 x 4 x 3 x 25 =  53 x ( 4 x 25 ) x 3

                         = 53 x 100 x 3

                         = 15900

327 x 73 + 27 x 327 = 327 x ( 73 + 27 )

                                 = 327 x 100

                                 = 32700

Hok Tốt nhen

a) \(52\times4\times3\times25\)

\(=\left(52\times3\right)\times\left(4\times25\right)\)

\(=156\times100\)

\(=15600\)

b) \(327\times73+27\times327\)

\(=327\left(73+27\right)\)

\(=327\times100\)

\(=32700\)

8/9

17/25

115/327

70/100

\(\dfrac{8}{9}\) \(\dfrac{17}{25}\)  \(\dfrac{115}{327}\)  \(\dfrac{73}{100}\)

8 / 9               17 / 25                    115 / 327                7 0 / 100

8 : 9 = \(\frac{8}{9}\)

17 : 25 = \(\frac{17}{25}\)

115 : 327 = \(\frac{115}{327}\)

73 : 100 = \(\frac{73}{100}\)

Nhớ k cho mk nha

8:9=8/9

17:25=17/25

115:237=115/237

73:100=73/100

\(8:9=\frac{8}{9}\)

\(17:25=\frac{17}{25}\)

\(115:327=\frac{115}{327}\)

\(73:100=\frac{73}{100}\)

hok tốt!!

a)2029

b)1215

c900

a,    29+132+237+868+763

     = 29+(132+868)+(237+763)

     = 29+1000+1000 =2029

b,    652+327+148+15+73

     = (652+148)+(327+73)+15

     = 800+400+15 =1215

c,    347+418+123+12

     = (347+123)+(418+12)

     = 470+430 =900

a, 29 + (132+868)+(237+763)

= 29+1000+1000=2029

b,(652+148)+(327+73) + 15=1215

c,(146+54)+(121+379) = 200+500=700

d,(-452-548)+(395+605)=-1000+1000=0

a)29+132+237+868+763

=161+1105+763

=1266+763

=2029

b)652+327+148+15+73

=979+163+73

=1142+73

=1215

c)146+121+54+379

=267+433

=700

d)(-452)+395+(-548)+605

=(-57)+57

=0

29+132+237+868+763

=29+(132+868)+(237+763)

=29+1000+1000

=2900+1000

=3900

652+327+148+15+73

=(652+148)+(327+73)+15

=800+400+15

=1200+15

=1215

146+121+54+379

= (146+54)+(121+379)

= 200+500

=700

(-452)+395+(-548)+605

=[(-452)+(-548)]+395+605

=(-1000)+395+605

=[(-1000)+395)]+605

=(-605)+605

=0

a) 185+434+515+266+155 = (185+515)+(434+266)+155

                                            = 700+700+155 = 1555

b. (652+148)+(327+73)+15=800+400+15=1215

c. (125*8)*(5*2)*1=1000*10*1=10000

d. (125*8)*(12*2)=1000*24=24000

e.3*25*4*2+4*37*6+2*38*12=600+888+912=2400

mik ik mik til lại cko nha! mấy bạn

a=1555

b=1188

c=10000

d=24000

e=2400

a) 185 + 434+ 515 + 266 + 155 

=(185+515)+(434+266)+155

=700+700+155

=1400+155

=1555

b) 652 + 327 + 148 + 15 + 73

=(652+147)+(327+73)+15

=800+400+15

=1215

c) 5 . 125 . 2 . 1 . 8

=10.1000

=10000

d) 8.12.125.2

=24.1000

=24000

e) 3.25.8.+4.37.6+2.38.12

=24.(25+37+38)

=24.100

=2400

3457 - 27 x 48 - 48 x 73 + 6543

=3457 - 48 x ( 27 + 73) + 6543

=3457 - 48 x 100 + 6543

=(3457+ 6543) - 4800

=10000- 4800

=5200