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\(\frac{1024}{\left(17x2^5+15x2^5\right)}=\frac{2^{10}}{32x2^5}=\frac{2^{10}}{2^5.2^5}=\frac{2^{10}}{2^{10}}=1\) (1024=210; 32=25)
chị giúp nhưng phải k cho c nhé.
\(1024:\left(17x2^5+15x2^5\right)\)
\(=\)\(1024:\left[\left(17+15\right)x2^5\right]\)
\(=1024:\left(32x2^5\right)\)
\(=2^{10}:\left(2^5x2^5\right)\)
\(=2^{10}:2^{10}=1\)
520 : ( 515 . 6 + 515 . 19)
=5^20: [5^15(6+19)]
=5^20:5^15.5^2
=5^3
\(5^{20}\div\left(5^{15}.6+5^{15}.19\right)\)
\(=\)\(5^{20}\div\left[5^{15}.\left(6+19\right)\right]\)
\(=\)\(5^{20}\div\left[5^{15}.25\right]\)
\(=\)\(5^{20}\div\left[5^{15}.5^2\right]\)
\(=\)\(5^{20}\div5^{17}\)
\(=\)\(5^3\)
\(=\)\(125\)
\(5^{20}:\left(5^{15}\cdot6+5^{15}\cdot19\right)\)
\(=5^{20}:\left[5^{15}\left(6+19\right)\right]\)
\(=5^{20}:\left(5^{15}\cdot5^2\right)\)
\(=5^{20}:5^{17}=5^3=125\)
\(5^{20}:\left(5^{15}\cdot6+5^{15}\cdot19\right)\)
\(=5^{20}:[5^{15}\cdot\left(6+19\right)\)
\(=5^{20}:\left(5^{15}\cdot25\right)\)
\(=5^{20}:\left(5^{15}\cdot5^2\right)\)
\(=5^{20}:5^{15+2}\)
\(=5^{20}:5^{17}\)
\(=5^{20-17}\)
\(=5^3\)
\(=125\)
<=> \(7x=5^2+3\)
<=> \(7x=28\)
<=> \(x=4\)
Vay x=4
chuc ban hoc tot !!!
6x + x = 511 : 59 + 31
7x = 52 + 3
7x = 25 + 3
7x = 28
x = 28 : 7
x = 4.
~ Chúc em học tốt nha ~ :3
\(12:\left\{390:\left[500-\left(5^3+7^2.5\right)\right]\right\}\)
\(=12:\left\{390:\left[500-\left(125+49.5\right)\right]\right\}\)
\(=12:\left\{390:\left[500-\left(125+245\right)\right]\right\}\)
\(=12:\left[390:\left(500-370\right)\right]\)
\(=12:\left(390:130\right)\)
\(=12:3\)
\(=4\)
12 : { 390 : [ 500 - ( 53 + 72 . 5 ) ] }
= 12 : { 390 : [ 500 - (125 + 49 . 5 ) ] }
= 12 : { 390 : [ 500 - (125 + 245 ) ] }
= 12 : { 390 : [ 500 - 370] }
= 12 : { 390 : 130}
= 12 : 3
= 4
Xin mời XD
\(\frac{5^{20}}{5^{16}+5^{15}.19}=\frac{5^{20}}{5^{15}\left(5+19\right)}=\frac{5^{20}}{5^{15}.24}=\frac{5^5}{24}\)
=\(5^{20}:\left(5^{15}.6+5^{15}+19\right)\)
=\(5^{20}:[5^{15}\left(6+19\right)\)
=\(5^{20}:[5^{15}.25]\)
=\(5^{20}:5^{15}.5^2\)
=\(5^3\)
520 : ( 515 . 6 + 515 + 19 )
= 520 : [ 515. ( 6 + 9 ) ]
= 520 : [ 515 . 15 ]
= 520 : 515 . 15
= 55 . 15
= 3125 . 15
= 46875