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a ) 13/20
B)
C..........................................................
minh dang tính
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a, 8^5=8192;3.4^7=3.16384=49152
=>8^5<3.4^7
b,cái nè dài quá nên chị viết ngắn gọn thôi ha!^.^
31^11>17^14
c,5^333<3^555
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Gọi phép tính 1^2+2^2+6^2 là A;phép tính 2^2+3^2+7^2 là B
*1^2=1
5^2=25
6^2=36
Vậy A=1^2+5^2+6^2=1+25+36=62
*2^2=4
3^2=9
7^2=49
Vậy B= 2^2+3^2+7^2=4+9+49=62
Suy ra A=B nhé
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\(\left|9+6\right|=\left|15\right|=15\)
\(\left|9\right|+\left|6\right|=9+6=15\)
\(\Rightarrow\left|9+6\right|=\left|9\right|+\left|6\right|\)
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Ta có: (+) (1/32)^7 = [(1/2)^5]^7 =(1/2)^35
(+) (1/16)^9= [(1/2)^4]^9 =(1/2)^36
Vì 35 <36
=> (1/2)^35 > (1/2)^36
=> (1/32)^7 > (1/16)^9
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311<1614
Vì 311=17747
1614=7205759404
=>311<1614
Vậy 311<1614
\(5^{11}và7^7=\left(5.7\right)^4và\left(7.5\right)^2=35^4>35^2\)
5 mũ 11 > 7 mũ 7