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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
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a) \(12^7:6^7=\left(12:6\right)^7=2^7\)
b) \(275:254=\frac{275}{254}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
ta có \(27^5:81^3=\left(3^3\right)^5:\left(3^4\right)^3=3^{15}:3^{12}\)
=\(3^{15-12}=3^3=27\)
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491.(267+53) + 491.(151+67) = 491.(267+53+151+67)
= 491 . 538
= 264158
![](https://rs.olm.vn/images/avt/0.png?1311)
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.
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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
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a,92+(-102)=-(102-92)=-10(số nào lớn thì lấy dấu số đó)
b,(-105)+87=-(105-87)=-18
c,312+(-419)=-(419-312)=-107
d,67-349=67+(-349)=-282
a, -(102 - 92) = ( - 10 )
b, - ( 105 - 87) = -18
c, -(419 - 312)= -107
d, 67 - 349 =-282