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\(2^{16}=2^{13+3}=2^{13}.2^3=8.2^{13}\)
Vì 8 > 7 nên \(8.2^{13}>7.2^{13}\)
\(\Rightarrow2^{16}>7.2^{13}\)
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\(445-52+155+452\\ =\left(445+155\right)+\left(452-52\right)\\ =600+4000\\ =1000\\ 102\cdot55-102\cdot73+51\cdot36\\ =102\cdot\left(55-73\right)+51\cdot36\\ =102\cdot\left(-18\right)+102\cdot18\\ =0\\ 4\cdot5\cdot2\cdot25\cdot5-1000\\ =5000-1000\\ =4000\\ 8782-291\cdot13\\ =4999\\ 254+\left\{38\cdot\left[\left(42-16\right):2\right]\right\}\\ =254+\left[38\cdot\left(26:2\right)\right]\\ =254+\left(38\cdot13\right)\\ =748\\ \left(2791\cdot34+7882:14\right)\cdot0+1510-510:2\\ =1510-255\\ =1255\)
a. \(445-52+155+452=\left(445+155\right)+\left(452-52\right)=600+400=1000\)
b. \(102\cdot55-102\cdot73+51\cdot36=102\left(55-73+18\right)=102\cdot0=0\)
c.\(4\cdot5\cdot2\cdot25\cdot5-1000=4\cdot25\cdot5\cdot5\cdot2-1000=100\cdot50-1000=5000-1000=4000\)
d. \(8782-291\cdot13=8782-3783=4999\)
e. \(254+\left\{38\left[\left(42-16\right)\div2\right]\right\}=254+\left\{30\cdot13\right\}=254+494=748\)
f. \(\left(2791\cdot34+7882\div14\right)\cdot0+1510-510\div2=0+1510-255=1255\)\
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a) \(625^5\)= \(\left(5^4\right)^5\)= \(5^{20}\)
\(125^7\)= \(\left(5^3\right)^7\)= \(5^{21}\)
Vì \(5^{20}\)< \(5^{21}\)
Nên \(625^5\)< \(125^7\)
b) \(5^{36}\)= \(3^{3.12}\)= \(\left(5^3\right)^{12}\)= \(125^{12}\)
\(11^{24}\)= \(11^{2.12}\)= \(\left(11^2\right)^{12}\)= \(121^{12}\)
Vì \(125^{12}\)> \(121^{12}\)
Nên \(5^{36}\)> \(11^{24}\)
c) Ghi ko rõ đề
a) 6255 = (54)5 = 520
1257 = (53)7 = 521
Do: 20 < 21 => 520 < 521 hay 6255 < 1257
b) 536 = (53)12 = 12512
1124 = (112)12 = 12112
Do: 125 > 121 => 12512 > 12112 hay 536 > 1124
c) Mình nghĩ đề bài có chút trục trặc vì nếu đề đúng thì chẳng phải quá rõ ràng là 7 < 216 rồi hay sao. Bạn chịu khó kiểm tra lại đề nhé!
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A=390(390-3) =3(90+90)-390=3180-390
B=(33)60=3(3.60) =3180
A-B=-390=>A<B
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131 . x - 942 = 2^7 . 2^3
131 . x - 942 = 2^10
131 . x - 942 = 1024
131 . x = 1024 + 942
131 . x = 1966
x = 1966 : 131
x \(\approx15\)
b ) [ ( x + 32 ) - 17 ] . 2 = 42
[ ( x + 32 ) - 17 ] = 42 : 2
( x + 32 ) - 17 = 21
x + 32 = 21 + 17
x + 32 = 38
x = 38 - 32
x = 6
\(2^{16}=2^{13}\times2^3=2^{13}\times8\Rightarrow7.2^{13}< 2^{16}\)
216 = 213 . 23 = 213 . 8
ma ta thay hai ve co chung 213 ma 8 > 7 nen 216 > 213 . 7