b/ (-127).57+(-127).43

=(-127)(57+43)

=(-127).10

=-1270

c/ (-13).34-87.34

=34.(-13-87)

=34.(-100)

=3400

a) (-14).(-125).(+3).(-8)

= [(-14).3].[(-125).(-8)]

=     -42  . 1000

=        -42000

b) (-127).57+(-127).43

= -127.(57+43)

= -127.100

=    -12700

c) (-13).34-87.34

= 34.(-13-87)

= 34.(-100)

=  -3400

d) (-25).68+(-34).(-250)

=  - 1700 + 8500

=         6800        ( bài này không cần phải tính hợp lý )

tick nha các bạn yêu quý

sdsds

a) \(12^7:6^7=\left(12:6\right)^7=2^7\)

b)  \(275:254=\frac{275}{254}\)

thực hiện các phép tính sau một cách gọn nhất 

a. 12⁷:6⁷

^b.275:254

a) 127:67=(12:6)7=27

b)  275:254=275254 

 dễ 

(10³ + 10⁴ + 125²) : 5³

= (2³.5³ + 2⁴.5⁴ + 5⁶) : 5³

= 5³.(2³ + 2⁴.5 + 5³) : 5³

= 2³ + 2⁴.5 + 5³

= 8 + 16.5 + 125

= 8 + 80 + 125

= 213

\(24^4.3^4-32^{12}:16^{12}=27^4-2^{12}=527345\)

ta có \(27^5:81^3=\left(3^3\right)^5:\left(3^4\right)^3=3^{15}:3^{12}\)

=\(3^{15-12}=3^3=27\)

491.(267+53) + 491.(151+67) = 491.(267+53+151+67)

                                                = 491 . 538

                                                = 264158

Đáp án:

 a, 38+41+117+159+6238+41+117+159+62

=(38+62)+(41+159)+117=(38+62)+(41+159)+117

=100     +200      +117=100     +200      +117

=417=417

b, 73+86+968+914+303273+86+968+914+3032

=73+(86+914)+(968+3032)=73+(86+914)+(968+3032)

=73+1000     +4000=73+1000     +4000

=5073=5073

c, 341.67+341.16+659.83341.67+341.16+659.83

=341.(67+16)+659.83=341.(67+16)+659.83

=341.83+659.83=341.83+659.83

=83.(341+659)=83.(341+659)

=83.1000=83000=83.1000=83000

d, 42.53+47.156−47.11442.53+47.156-47.114

=42.53+47.(156−114)=42.53+47.(156-114)

=42.53 +47.42=42.53 +47.42

=42.(53+47)=42.100=42.(53+47)=42.100

=4200=4200

e, 563.23+23.26+23563.23+23.26+23

=23.(563+26+1)=23.(563+26+1)

=23.600=23.600

=13800=13800

f, 132+157+43+68132+157+43+68

=(132+68)+(157+43)=(132+68)+(157+43)

=200      +200=400=200      +200=400

g, 49.68+100.34+6849.68+100.34+68

=49.68+50.68+68=49.68+50.68+68

=68.(49+50+1)=68.(49+50+1)

=68.100=6800=68.100=6800

h, 491.(267+53)+491.(151+67)491.(267+53)+491.(151+67)

=491.(267+53+151+67)=491.(267+53+151+67)

=491.538=491.538

=264158=264158

Vote mk nha.

12⁷:6⁷=(12:6)⁷=2⁷

27⁵:81=(3³)⁵:3⁴=3¹⁵:3⁴=3¹¹

18³:9³=(18:9)³=2³=8

L-i-k-e cho mình nha bạn