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b)Có \(63^7< 64^7\)
\(64^7=\left(2^6\right)^7=2^{42}\)
\(16^{12}=\left(2^4\right)^{12}=2^{48}\)
Mà \(2^{42}< 2^{48}\Rightarrow63^7< 64^7< 16^{12}\Rightarrow63^7< 16^{12}\)
\(\text{a) }\left(-\frac{1}{16}\right)^{100}=\frac{\left(-1\right)^{100}}{16^{100}}=\frac{1}{16^{100}}\)
\(\left(-\frac{1}{2}\right)^{500}=\frac{\left(-1\right)^{500}}{2^{500}}=\frac{1}{\left(2^5\right)^{100}}=\frac{1}{32^{100}}\)
Ta co
\(16^{100}< 32^{100}\)
\(\Rightarrow\frac{1}{16^{100}}>\frac{1}{32^{100}}\)
\(\Rightarrow\left(-\frac{1}{16}\right)^{100}>\left(-\frac{1}{2}\right)^{500}\)
a.
Ta có:
\(\left(-\frac{1}{16}\right)^{100}=\frac{\left(-1\right)^{100}}{16^{100}}=\frac{1}{16^{100}}\)
\(\left(-\frac{1}{2}\right)^{500}=\frac{\left(-1\right)^{500}}{2^{500}}=\frac{1}{\left(2^5\right)^{100}}=\frac{1}{32^{100}}\)
Vì \(\frac{1}{16^{100}}>\frac{1}{32^{100}}\Rightarrow\left(-\frac{1}{16}\right)^{100}>\left(-\frac{1}{2}\right)^{500}\)
b.
Ta có:
\(\left(-32\right)^9=\left[-\left(2^5\right)\right]^9=-\left(2^{45}\right)\)
\(\left(-16\right)^{13}=\left[-\left(2^4\right)\right]^{13}=-\left(2^{52}\right)\)
Vì \(-\left(2^{45}\right)>-\left(2^{52}\right)\Rightarrow\left(-32\right)^9>\left(-16\right)^{13}\)
#Chúc bạn học tốt!#
d, ta có :(-32)9=-(329) ;(-18)13=-(1813)
329=32\(\times\)328=32\(\times\)(322)4=32\(\times\)10244=32\(\times\)1024\(\times\)10243
1813=18\(\times\)1812=18\(\times\)(183)4=18\(\times\)58324=18\(\times\)5832\(\times\)58323
18\(\times\)5832 >16\(\times\)5832=32\(\times\)2916>32\(\times\)1024 =58323>10243
nên 1813>329
vậy (-18)13 <(-32)9
(-32)9=-(329)
(-18)13=-(1813)
329<369
ta có :369=(2\(\times\)18)9=29\(\times\)189
vì 184>164mà 164=(24)4=216
mà 216>29
\(\Rightarrow\)184>29
\(\Rightarrow\)184\(\times\)189>29\(\times\)189
\(\Rightarrow\)1813>369mà 369 >329
\(\Rightarrow\)1813>329
\(\Rightarrow\)(-18)13<(-32)9
\(\frac{2011.4023+2012}{2012.4023-2011}=\frac{2011.4023+2011+1}{2012.4023-2012-1}=\frac{2011.4023+2011.1+1}{2012.4023-2012.1-1}\)
\(=>\frac{2012.4023+2012.1+1}{2012.4023-2012.1-1}=\frac{2012.\left(4023+1\right)+1}{2012.\left(4023-1\right)-1}\)
\(=\frac{4023+1+1}{4023-1-1}=\frac{4023+2}{4023-2}=\frac{4025}{4021}\)
Vì 4025 > 4021 ( tử số lớn hơn mẫu số ) nên suy ra : 4025/4021 >1
<br class="Apple-interchange-newline"><div id="inner-editor"></div>=>2012.4023+2012.1+12012.4023−2012.1−1 =2012.(4023+1)+12012.(4023−1)−1
=4023+1+14023−1−1 =4023+24023−2 =40254021
Vì 4025 > 4021 ( tử số lớn hơn mẫu số ) nên suy ra : 4025/4021 >1
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
Bài 1:
Ta có:
\(\left(\frac{1}{10}\right)^{15}=\left(\frac{1}{5}\right)^{3.5}=\left(\frac{1}{125}\right)^5\)
\(\left(\frac{3}{10}\right)^{20}=\left(\frac{3}{10}\right)^{4.5}=\left(\frac{81}{10000}\right)^5\)
Lại có:
\(\frac{1}{125}=\frac{80}{10000}< \frac{81}{10000}\Rightarrow\left(\frac{1}{125}\right)^5< \left(\frac{81}{10000}\right)^5\)
\(\Rightarrow\left(\frac{1}{10}\right)^{15}< \left(\frac{3}{10}\right)^{20}\)
Bài 2:
Ta có:
\(A=\frac{13^{15}+1}{13^{16}+1}\Rightarrow13A=\frac{13^{16}+13}{13^{16}+1}=1+\frac{12}{13^{16}+1}\)
\(B=\frac{13^{16}+1}{13^{17}+1}\Rightarrow13B=\frac{13^{17}+13}{13^{17}+1}=1+\frac{12}{13^{17}+1}\)
Mà \(\frac{12}{13^{16}+1}>\frac{12}{13^{17}+1}\)
\(\Rightarrow1+\frac{12}{13^{16}+1}>1+\frac{12}{13^{17}+1}\)
\(\Rightarrow13A>13B\Rightarrow A>B\)
Ta có :
\(\left(\frac{1}{32}\right)^7=\frac{1^7}{32^7}=\frac{1}{\left(2^5\right)^7}=\frac{1}{2^{5.7}}=\frac{1}{2^{35}}\)
\(\left(\frac{1}{16}\right)^9=\frac{1^9}{16^9}=\frac{1}{\left(2^4\right)^9}=\frac{1}{2^{4.9}}=\frac{1}{2^{36}}\)
Vì \(\frac{1}{2^{35}}>\frac{1}{2^{36}}\) ( cùng tử, mẫu nào bé hơn thì phân số đó lớn hơn ) nên \(\left(\frac{1}{32}\right)^7>\left(\frac{1}{16}\right)^9\)
Vậy \(\left(\frac{1}{32}\right)^7>\left(\frac{1}{16}\right)^9\)
Chúc bạn học tốt ~
Ta có : \(\left(\frac{1}{32}\right)^7=\left(\frac{1}{2^5}\right)^7=\frac{1}{2^{35}}\)
\(\left(\frac{1}{16}\right)^9=\left(\frac{1}{2^4}\right)^9=\frac{1}{2^{36}}\)
DO : \(\frac{1}{2^{35}}>\frac{1}{2^{36}}\)\(\Rightarrow\left(\frac{1}{32}\right)^7>\left(\frac{1}{16}\right)^9\)
Tk mk nha !!!
a) Ta có : 3111 < 3211 = (25)11 = 255
1714>1614 = (24)14=256
=> 3111 <255<256<1714
=>3111<1714
b)Ta có : 1617 = (24)17 = 268
822 = (23)22 = 266
Vì 268>266 nên 1617 >822
c) Ta có : 10750 <10850= (4.27)50 = 450 .2750 = 2100 . 3150
7375 >7275 = (8.9)75 = 875 . 975 = 2225 . 3150
=> 10750 <2100 .3150 <2225.3150<7375
=> 10750 <7375
d) Ta có : 291 >290 = (25)18 = 3218
535<536 = (52)18 = 2518
Vì 3218 >2518 nên 291 > 535.
e) Ta có : \(\left(\frac{1}{32}\right)^7=\frac{1}{32^7}=\frac{1}{2^{35}}\)
\(\left(\frac{1}{16}\right)^9=\frac{1}{16^9}=\frac{1}{2^{36}}\)
Vì \(\frac{1}{2^{35}}>\frac{1}{2^{36}}\) nên \(\left(\frac{1}{32}\right)^7>\left(\frac{1}{16}\right)^9\)
thanks