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( 17x - 25 ) : 8 + 65 = 9^2
( 17x - 25 ) : 8 + 65 = 81
( 17x - 25 ) : 8 = 81 - 65
( 17x - 25 ) : 8 = 16
( 17x - 25 ) = 16 x 8
( 17x - 25 ) = 128
17x = 128 + 25
17x = 153
x = 153 : 17
x = 9
\(\left(17x-25\right):8+65=9^2\)
\(\Leftrightarrow\left(17x-25\right):8=81-65\)
\(\Leftrightarrow\left(17x-25\right):8=16\)
\(\Leftrightarrow17x-25=16.8\Leftrightarrow17x=128+25\Leftrightarrow17x=153\Leftrightarrow x=153:17=9\)
(k cho mình với nhá!)
\(\left(17x-25\right):8+65=9^2\)
=> \(\frac{17x}{8}-\frac{25}{8}+65=81\)
=> \(\frac{17x}{8}=81-65+\frac{25}{8}\)
=> \(\frac{17x}{8}=\frac{153}{8}\)
=> \(17x=\left(153.8\right):8\)
=> \(17x=153\)
=> \(x=153:17=9\)
(17x - 25 ) : 8 + 65 = 92
(17x - 25 ) : 8 + 65 = 81
(17x - 25) : 8 = 81 - 65 = 16
17x - 25 = 16 x 8 = 128
17x = 128+25=153
x= 153:17 =9
(17x-25):8+65=92
(17x-25):8 =92-65
(17x-25):8 =27
(17x-25) =\(27\times8\)
(17x-25) =216
17x =216+25
17x =241
x =241:7
x =\(\frac{241}{17}\)
T mk nhé bạn ^...^ ^_^
(17x-25):8+65=92
(17x-25):8=92-65
(17x-25):8=27
(17x-25)=27.8
17x-25=216
17x=216+25
17x=241
x=241:17
x=
S\(=5+5^2+...+5^{2012}\)
=> S \(=(5+5^2+5^3+5^4)+(5^{2009}+5^{2010}+5^{2011}+5^{2012})\)
=> S = \((5+5^2+5^3+5^4)+...+5^{2008}\cdot(5+5^2+5^3+5^4)\)
=> S = \(780+...+5^{2008}\cdot780\)
=> S= \(780\cdot(1+...+5^{2008})\)
=> S=\(12.65.(1+...+5^{2008})⋮5(đpcm)\)
\(\left(-2\right)^3.3\left(-2\right)^2-5.0+18\)
\(=\left(-2\right)^5.3-0+18\)
\(=\left(-32\right).3+18\)
\(=\left(-96\right)+18\)
\(=-78\)
\(\dfrac{2}{3}+\dfrac{3}{4}+\dfrac{-4}{9}\)
\(=\dfrac{24}{36}+\dfrac{27}{36}+\dfrac{-16}{36}\)
\(=\dfrac{51}{36}+\dfrac{-16}{36}\)
\(=\dfrac{35}{36}\)
Câu cuối cùng thiếu dấu nên mình không làm được nha bạn :))
a)
5.(12-x)-20=30
⇒60-5x-20=30
⇒-5x=30+20-60
⇒-5x=-10
⇒x=2
b)(17x - 25 ) : 8 + 65 = 92
(17x - 25 ) : 8 + 65 = 81
17x - 25 = 16 x 8 = 128
17x = 128+25=153
x= 153:17 =9
c)
x=23
Giải thích các bước giải:
3x – 10 = 2x + 13
3x-2x=13+10
x=23
d)4(2x+7)-3(3x-2)=24
4.2x+4.7-3.3x+3.2=24
8x+28-9x+6=24
8x-9x=24-28-6=-10
=>(-1)x=-10
x=-10:(-1)
x=10
a. \(5\cdot\left(12-x\right)-20=30\Leftrightarrow5\left(12-x\right)=50\)
\(\Leftrightarrow12-x=50:5=10\)
\(\Leftrightarrow x=12-10=2\)
b. \(\left(17x-25\right):8+65=9^2\)
\(\Leftrightarrow\left(17x-25\right):8=81-65=16\)
\(\Leftrightarrow17x-25=16:8=2\)
\(\Leftrightarrow17x=2+25=27\Leftrightarrow x=\frac{27}{17}\)
c. \(3x-10=2x+13\)
\(\Leftrightarrow3x-2x=10+13\)
\(\Leftrightarrow x=23\)
d. \(4\cdot\left(2x+7\right)-3\cdot\left(3x-2\right)=24\)
\(\Leftrightarrow8x+28-9x+6=24\)
\(\Leftrightarrow34-x=24\Leftrightarrow x=10\)
(x-10) . 11 = 22
x - 10 = 22 : 11
x - 10 = 2
=> x = 12
b, 2x + 15 = (-27)
2x = (-27)- 15
2x = - 42
=> x = -21
c , tự làm
a) ( x - 10 ) . 11 = 22
x - 10 = 22 : 11
x - 10 = 2
x = 2 + 10
x = 12
Vậy x = 12
b) 2x + 15 = - 27
2x = - 27 - 15
2x = - 42
x = - 42 : 2
x = - 21
Vậy x=-21
c) - 765 - ( 305 + x ) = 100
305 + x = - 765 - 100
305 + x = - 865
x = - 865 - 305
x = - 1170
Vậy x=-1170
d)2x:4=16
2x:22=24
2x-2=24
=> x-2=4
x=4+2
x=6
Vậy x=6
f) ( 17x - 25 ) : 8 + 65 = 92
( 17x - 25 ) : 8 + 65 = 81
( 17x - 25 ) : 8 = 81 - 65
( 17x - 25 ) : 8 = 16
17x - 25 = 16 . 8
17x - 25 = 128
17x = 128 + 25
17x = 153
x = 153 : 17
x = 9
Vậy x=9
`(17x -25) : 8 + 65 =9^2`
`=> (17x -25) : 8 =81 -65`
`=> (17x -25) : 8 =16`
`=>17x -25=16 xx 8`
`=>17x -25=128`
`=>17x=128 + 25`
`=>17x=153`
`=>x=153:17`
`=>x=9`