\(a.12\times125\times54\)

\(=1500\times54\)

\(=81000\)

\(b.64\times125\times54\)

\(=8000\times54\)

\(=432000\)

\(c.36\times\left[143+57\right]+64+\left(143+57\right)\)

\(=36\times200+64+200\)

\(=7200+64+200\)

\(=7264+200\)

\(=7464\)

a) =81000

b) 432000

c) 7464

d) 7414

e) 1427

cam on cac ban nhieu nhe lan sau co bai toan nho  giup do minh nhe ban

a) -72.17+72.31 - 36 . 228

 = -72.17 + 72. 31 - 36.2.114

 = -72 .17 + 72 . 31 -72 . 114

 = -72. ( 17-31+114)

 = -72 . 100

 = -7200

b) ..........

 = -7 . ( 16-36.9) -(-125) 

 = -7 . ( 16-324) +125

 =-7 . ( -308) +125

 = 2156+125

 = 2281

$a)$

$-72.17+72.31-36.228$

$=-72.17+72.31-36.2.114$

$=-72.17+72.31-72.114$

$=72(31-17-114)$

$=72.(-100)=-7200$

$b)$$-7.[{(-2)}^4+(-36):(-3^2)]-{(-5)}^3$

$=-7.[16-36:(-9)]+125$

$=-7.[16--4]+125$

$=-7.20+125$

$=-140+125$

$=-15$

$c)$$(57-725)-(605-53)$

$=57-725-605+53$

$=(57+53)-120$

$=110-120=-10$

$a)$

$-72.17+72.31-36.228$

$=-72.17+72.31-36.2.114$

$=-72.17+72.31-72.114$

$=72(31-17-114)$

$=72.(-100)=-7200$

a, -321 + (-29 ) - 142 - (-72) = -321 - 29 - 142 + 72 = -420.

b, 214 - (-36) + (-305) = 214 + 36 - 305 = -55.

c, 232 - (581 + 132 - 331) = 232 - 581 - 132 + 331 = -150.

d, [ 12+ (-57)] - [-57 -  (-12) = 12 - 57 + 57 - 12 = 0.

49439808/11

\(=\dfrac{36\cdot22\cdot51}{11\cdot17\cdot72}=\dfrac{1}{2}\cdot3\cdot2=3\)

a: =(21-11)+(22-12)+(23-13)+(24-14)

=10+10+10+10

=40

b: =(34-14)+(35-15)+(36-16)+(37-17)

=20+20+20+20

=80

a, =(21-11)+(22-12)+(23-13)+(24-14)

=10+10+10+10

=40

b. =(34-14)+(35-15)+(36-16)+(37-17)

=20+20+20+20

=80

c,55+56+57+58-35-36-37-38

  =111+57+58-35-36-37-38

  =168+58-35-36-37-38

  =226-35-36-37-38

  =191-36-37-38

  =155-37-38

  =118-38

  =80

a) \(-\frac{11}{18}\)

b)\(-\frac{3}{2}\)

c)\(\frac{49}{78}\)

d)\(\frac{23}{11}\)

e) \(\frac{11.12+22.24+44.48}{33.36+66.72+132.144}\)

\(=\frac{11.12+22.24+44.48}{11.3.12.3+22.3.3.24+44.3.348}\)

\(=\frac{11.12+22.24+44.48}{\left(1.12+22.24+44.48\right).9}\)

\(=\frac{1}{9}\)

???

a,(2400+72)x24

=24x2400+72x24

=57600+1728

=59328

b,(3600-180):36

=3600:36+180:36

=100+5

=105

c,(525+315):15

=525:15+315:15

=35+21

=56

d,(1026-741):57

=1026:57-741:57

=18-13

=5

a)(2400+72)x24

=2472.24

=4128

b)(3600-180):36

=3420:36

=95

c,(525+315):15

=840:15

=56

d,(1026-741):57

=285:57

=5

Học Tốt !!!

máy tính đi bạn mình mệt quá

thôi để mình làm luôn :

a)(-36)-39=-75

b)

-72+(-16)=-88

c)48+|48-174|+(-74)

=48+|-126|-74

=48+126-74

=174-74

=100

d)(-57)+(-159)+47+169

=(-57)-159+47+169

=-216+47+169

=-169+169

=0