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1) x - 36 + 12 = - x+ 10
=> x + x = 10 + 24
=> 2x = 34
=> x = 34/2 = 17
2) (x + 15) - (11 - x) = (-2)2
=> x + 15 - 11 + x = 4
=> 2x = 4 - 4
=> 2x = 0
=> x = 0
3) 40 - 4x2 = (-6)2
=> 40 - 4x2 = 36
=> 4x2 = 40 - 36
=> 4x2 = 4
=> x2 = 1
=> x = \(\pm\)1
4) (-50) + 10x2 = (-25) x |-2|
=> -50 + 10x2 = -50
=> 10x2 = -50 + 50
=> 10x2 = 0
=> x2 = 0
=> x = 0
5) |x + 1| = 2020
=> \(\orbr{\begin{cases}x+1=2020\\x+1=-2020\end{cases}}\)
=> \(\orbr{\begin{cases}x=2019\\x=-2021\end{cases}}\)
6) (x + 1)5 + 8 = 0 (xem lại đề)
7) (-20) + x3 : 16 = -24
=> x3 : 16 = -24 + 20
=> x3 : 16 = -4
=> x3 = -4 . 16
=> x3 = -64 = (-4)3
=> x = -4
9) x14 = x17
=> x14 - x17 = 0
=> x14(1 - x3) = 0
=> \(\orbr{\begin{cases}x^{14}=0\\1-x^3=0\end{cases}}\)
=> \(\orbr{\begin{cases}x=0\\x=1\end{cases}}\)
10) (-36) + (1 - x)2 = 0
=> (1 - x)2 = 36
=> (1 - x)2 = 62
=> \(\orbr{\begin{cases}1-x=6\\1-x=-6\end{cases}}\)
=> \(\orbr{\begin{cases}x=-5\\x=7\end{cases}}\)
a. {[(2:x + 14) : 22 - 3] : 2} - 1 = 0
[(2:x + 14) : 4 - 3] : 2 = 1
(2:x + 14) : 4 - 3 = 2
(2:x + 14) : 4 = 5
2:x + 14 = 20
2:x = 6
x = 2:6
x = 1/3
b. 10 - {[(x:3 + 17) : 10 + 3.16] : 10} = 5
[(x:3 + 17) : 10 + 48] : 10 = 5
(x:3 + 17) : 10 + 48 = 50
(x:3 + 17) : 10 = 2
x:3 + 17 = 20
x:3 = 3
x = 9
2.
a,. 1619 = (24)19 = 276
825 = (23)25 = 275
Vì 276 > 275 nên 1619 > 825
b. 2711 = (33)11 = 333
818 = (34)8 = 332
Vì 333 > 332 nên 2711 > 818
Bài 1: a)
\(\left\{\left[\left(2\div x+14\right)\div2^2-3\right]\div2\right\}-1=0\)
\(\Rightarrow\left[\left(2\div x+14\right)\div2^2-3\right]\div2=1\)
\(\Rightarrow\left(2\div x+14\right)\div2^2-3=2\)
\(\Rightarrow\left(2\div x+14\right)\div2^2=5\)
\(\Rightarrow2\div x+14=5\times2^2=20\)
\(\Rightarrow2\div x=6\Rightarrow x=\dfrac{1}{3}\)
Vậy \(x=\dfrac{1}{3}\)
Câu b tương tự nhan bạn!!!
2) a)
Ta có : \(16^{19}=\left(2^4\right)^{19}=2^{76}\)
\(8^{25}=\left(2^3\right)^{25}=2^{75}\)
Vì \(2^{76}>2^{75}\) nên \(16^{19}>8^{25}\)
Câu b cũng tương tự nha bạn làm cơ số bằng mũ ba là ra thui
~ Học tốt ~
a) \(3\times\left(-2\right)+4\times6-2^2+\left(-2\right)^2\)
\(=\left(-6\right)+24-4+4\)
\(=18-4+4\)
\(=14+4\)
\(=18\)
b) \(-25-40+3\times6\)
\(=-25-40+18\)
\(=-65+18\)
\(=-47\)
c) \(30\times\left(-10\right)-30\times90\)
\(=\left(-300\right)-2700\)
\(=-3000\)
Chúc bạn học tốt
1,
\(\dfrac{6}{7}\) + \(\dfrac{-5}{8}\) : (-5) -\(\dfrac{3}{16}\) . \(\left(-2\right)^2\)
= \(\dfrac{6}{7}\) + \(\dfrac{-5}{8}\) . \(\dfrac{-1}{5}\) - \(\dfrac{3}{16}\) . 4
= \(\dfrac{6}{7}\) + \(\dfrac{1}{8}\) - \(\dfrac{3}{4}\)
= \(\dfrac{48}{56}\) + \(\dfrac{7}{56}\) - \(\dfrac{42}{56}\)
= \(\dfrac{13}{56}\)
3,
a,\(\dfrac{3}{5}\)x - \(\dfrac{7}{10}\)x = \(\dfrac{-1}{2}\)
x.(\(\dfrac{3}{5}\) - \(\dfrac{7}{10}\)) = \(\dfrac{-1}{2}\)
x.\(\dfrac{-1}{10}\)= \(\dfrac{-1}{2}\)
x =\(\dfrac{-1}{2}\):\(\dfrac{-1}{10}\)
x = 5
c, (2,5x - 3,6) : \(\dfrac{15}{7}\) = -1
( \(\dfrac{5}{2}\)x - \(\dfrac{18}{5}\)) : \(\dfrac{15}{7}\) = -1
\(\dfrac{5}{2}\)x - \(\dfrac{18}{5}\) = -1 . \(\dfrac{15}{7}\)
\(\dfrac{5}{2}\)x - \(\dfrac{18}{5}\) = \(\dfrac{-15}{7}\)
\(\dfrac{5}{2}\)x = \(\dfrac{-15}{7}\) + \(\dfrac{18}{5}\)
\(\dfrac{5}{2}\)x = \(\dfrac{51}{35}\)
x =\(\dfrac{51}{35}\) : \(\dfrac{5}{2}\)
x = \(\dfrac{102}{175}\)
Mình không biết có chỗ nào sai không nữa.
B) 2017100.(x-60)=2017101
x-60=2017101 : 2017100
x-60 = 2017
x= 2017 + 60
x= 2077
C) 5.x+3.(10-x)+x=45
5x+30 - 3x + x = 45
3x = 45-30
3x = 15
x= 5
A) (17x-25):8+65=92
(17x-25):8 = 81 - 65
(17x-25):8 = 16
17x-25= 16:8
17x = 2+27
17x = 29
x= 29/17
a)(x+810)/7-40=32*5/2
(x+810)/7-40=80
(x+810)/7=80+20
(x+810)/7=120
x+810=120*7
x+810=840
x=840-810
x=30
b)2x-15=17
2x=17+15=32=25
=>x=5
c)3x-25=56
3x=56+25=81=34
=>x=4
d)x10=1x
x=1;0
g)x10=x
x10-x=0
x(x9-1)=0
=>x=0 hoặc x9-1=0
x9=0+1=1=19
Vậy x=1 hoặc x=-1
bài 1
a)
=> 3(x-2)=60-51
=> 3(x-2) =9
=> x-2 =9:3
=> x-2 =3
=> x =3+2
=> x =5
b)
=>4x-20=25-2
=>4x-20=23
=>4x-20=8
=>4x=8+20
=>4x=28
=>x=28:4
=>x=7
c)
=> 25+x.5-64=251
=> x.5-64 =251-25
=> x.5-64 =226
=> x.5 =226+64
=> x.5 =290
=> x =290:5
=> x =58
d)
=> [(14)2 - (12)2].2x=1872
=> 52.2x =1872
=> 104x =1872
=> x = 1872:104
=> x=18
e)
x10=x
=> x10-x=0
=>x(x9-1)=0
=>\(\orbr{\begin{cases}x=0\\x^9-1=0\end{cases}\Rightarrow\orbr{\begin{cases}x=0\\x^9=1\Rightarrow x=1\end{cases}}}\)
nha
mình sẽ làm típ
T I C K cho mình mình sẽ làm típ
a) 40 - x = 25
x = 40 - 25
x = 15
b) x - 1 = 10 + [ 90 - ( 17 - 8 ) 2 ]
x - 1 = 10 + [ 90 - 92 ]
x - 1 = 10 + [ 90 - 81 ]
x - 1 = 10 + 9
x - 1 = 19
x = 19 + 1
x = 20
a)15
b)20
tk nhe@@@@@@@@@@!!
ai tk minh minh tk lai