659 - [ 200 + ( 17 - 72 ) ]
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\(2^{500}\)và \(5^{200}\)
\(2^{500}=\left(2^5\right)^{100}=32^{100}\)
\(5^{200}=\left(5^2\right)^{100}=25^{100}\)
Ta thấy :
\(32^{100}>25^{100}\Rightarrow2^{500}>5^{200}\)
\(31^{11}\) và \(17^{14}\)
\(31^{11}< 32^{12}=\left(2^5\right)^{12}\)
\(17^{14}< 18^{14}=\left(9.2\right)^{14}\)
Ta thấy \(\left(2^5\right)^{12}< \left(9.2\right)^{14}\Rightarrow31^{11}>17^{14}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
341 x 16 + 341 x 67 + 659 x 83
= 341 x ( 16 + 67 ) + 659 x 83
= 341 x 83 + 659 x 83
= ( 341 + 659 ) x 83
= 1000 x 83
= 83000
27 x 72 + 27 x 27 +27
= 27x 72 + 27x 27 + 27 x 1
= 27 x ( 72 + 27 + 1 )
= 27 x 100
= 2700
hok tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
a) − 1 4 .13 9 11 − 0 , 25.6 2 11 = − 1 4 .13 9 11 − 1 4 .6 2 11 = − 1 4 . 13 9 11 + 6 2 11 = − 1 4 .20 = − 5
b) 4 9 : − 1 7 + 6 5 9 : − 1 7 = 4 9 . − 7 + 6 5 9 . − 7 = − 7 . 4 9 + 6 5 9 = − 7 .7 = − 49
![](https://rs.olm.vn/images/avt/0.png?1311)
a) − 1 4 .13 9 11 − 0 , 25.6 2 11 = − 1 4 .13 9 11 − 1 4 .6 2 11 = − 1 4 . 13 9 11 + 6 2 11 = − 1 4 .20 = − 5
b) 4 9 : − 1 7 + 6 5 9 : − 1 7 = 4 9 . − 7 + 6 5 9 . − 7 = − 7 . 4 9 + 6 5 9 = − 7 .7 = − 49
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(=2011+5\cdot\left[300-10^2\right]\)
\(=2011+5\cdot200\)
=1011
b: \(=695-\left[200+10^2\right]\)
=695-300
=395
a) =2011+5.200
=3011
b)=695-300
=395
c)1=29-5.4
=109
d)=2010-2000:400
=2010-5
=2005
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài làm
24 x 659 - 659 x 4 + 79 x 659 + 659
= 659 x ( 24 - 4 + 79 + 1 )
= 659 x 100
= 65900
# Chúc bạn học tốt #
![](https://rs.olm.vn/images/avt/0.png?1311)
\(341.67+341.16+659.83=341\left(67+16\right)+659.83\)
\(=341.83+659.83\)
\(=83\left(341+659\right)\)
\(=83.1000=83000\)
341x67+341x16+659x83
=341x(67+16)+659x83
=341x83+659x83
=83x(341+659)
=83x1000
=83000
nhớ tk mk nhé các bn
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 52 :
a) 14/21 = 2/3 và 60/72 = 5/6
Vì 2/3 = 4/6 < 5/6 nên 2/3 < 5/6
Bài 53 :
a) Vì 200 < 314 nên 17/200 > 17/314
b) Ta có 11/54 < 11/37 < 22/37 nên 11/54 < 22/37
![](https://rs.olm.vn/images/avt/0.png?1311)
\(659-\left[200+\left(17-7^2\right)\right]\)
\(=659-\left[200+\left(17-49\right)\right]\)
\(=659-\left(200-42\right)\)
\(=659-158\)
\(=501\)