Bt1
A, x.3+5.x = 256
B, 42.x-37.x = 205
C, 34.x-29.x = 155
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27 tháng 3 2020
a,-2x -(x-17)=34-(-x+25)
-2x-x+17=34+x-25
-3x+17=9+x
-3x-x=9-17
-4x=-8
-->4x=8
x=8:4
x=2
Vậy x=2
b,17-(16x-37)=2x+43
17-16x+37=2x+43
20-16x=2x+43
-16x-2x=43-20
-18x=23
x=23:(-18)
x=23/-18
Mà x là số nguyên nên --> x thuộc tập rỗng
c,-2x-3.(x-17)=34-2(-x+25)
-2x-3x+51=34-2.(-x)-25
-5x+51=9-(-2).x
-5x+(-2).x=9-51
-7x=-42
7x=42
x=42:7
x=6
Vậy x=6
F
6
17 tháng 5 2022
a,=3/13.17/29.29/34
=3/13.1/2
=3/26
b,=(4/21+25/42).19/33
=11/14.19/33
=19/42
17 tháng 5 2022
`a, = 3/13 xx (17/29 xx 29/34)`
`= 3/13 xx 1/2`
`= 3/26`.
`b, = 19/33(4/21 + 25/42)`
`= 19/33 xx ( 33/42 )`
`= 19/42`
7 tháng 8 2020
a. 8 x 37 x 5 x 25 = (8 x 25) x 37 x 5
= 200 x 5 x 37 = 1000 x 37 = 37000
b. 48 x 34 + 6 x 66 x 8 = 48 x 34 + 48 x 66 = 48 x ( 34 + 66) = 48 x 100 = 4800
c. 17 x (13 - 5) + 17 x 5 = 17 x 8 + 17 x 5 = 17 x (8 + 5) = 17 x 13 = 221
d. 78 x 100 - 100 = 78 x 100 - 100 x 1 = 100(78 - 1) = 100 x 77 = 7700
e. 6 x 17 x 8 + 3 x 37 x 16 + 4 x 46 x 12
= 48 x 17 + 48 x 37 + 48 x 46
= 48 x (17 + 37 + 46)
= 48 x 100 = 4800
f. 47 x 43 + 47 x 73 - 8 x 47 x 2 = 47 x 43 + 47 x 73 - 47 x 16 = 47 x (43 + 73 - 16) = 47 x 100 = 4700
7 tháng 8 2020
8×37×5×25=296×5×25=1480×25=37000
48×34+6×66×8=1632+396×8=1632+3168=4800
15×(13-7)+17×5=15×6+17×5=90+85=175
78×100-100=7800-100=7700
H9
HT.Phong (9A5)
CTVHS
13 tháng 7 2023
a) \(\dfrac{25}{37}\times\dfrac{18}{29}+\dfrac{18}{29}\times\dfrac{12}{37}\)
\(=\dfrac{18}{29}\times\left(\dfrac{25}{37}+\dfrac{12}{37}\right)\)
\(=\dfrac{18}{29}\times\dfrac{37}{37}\)
\(=\dfrac{18}{29}\times1\)
\(=\dfrac{18}{29}\)
b) \(\dfrac{31}{85}\times\dfrac{11}{19}+\dfrac{31}{85}\times\dfrac{12}{19}-\dfrac{42}{19}\times\dfrac{31}{85}\)
\(=\dfrac{31}{85}\times\left(\dfrac{11}{19}+\dfrac{12}{19}-\dfrac{42}{19}\right)\)
\(=\dfrac{31}{85}\times\dfrac{-19}{19}\)
\(=\dfrac{31}{85}\times-1\)
\(=-\dfrac{31}{85}\)
c) \(\dfrac{16}{53}:\dfrac{17}{9}-\dfrac{16}{53}:\dfrac{17}{8}\)
\(=\dfrac{16}{53}:\left(\dfrac{9}{17}-\dfrac{8}{17}\right)\)
\(=\dfrac{16}{53}:\dfrac{1}{17}\)
\(=\dfrac{16}{901}\)
c) \(\dfrac{1}{5}\times\dfrac{12}{31}\times\dfrac{4}{3}+\dfrac{19}{31}\times\dfrac{4}{15}\)
\(=\dfrac{4}{15}\times\dfrac{12}{31}+\dfrac{19}{31}\times\dfrac{4}{15}\)
\(=\dfrac{4}{15}\times\left(\dfrac{12}{31}+\dfrac{19}{31}\right)\)
\(=\dfrac{4}{15}\times\dfrac{31}{31}\)
\(=\dfrac{4}{15}\times1\)
\(=\dfrac{4}{15}\)
13 tháng 7 2023
a: =18/29*(25/37+12/37)
=18/29
b: =31/85(11/19+12/19-42/19)
=-31/85
c; =16/53(9/17+8/17)=16/53
d: =4/15(12/31+19/31)=4/15
HL
1
PT
7 tháng 1 2018
a. \(158-x=-12\)
\(x=158+12\)
\(x=170\)
b. \(37+x=12\)
\(x=12-37\)
\(x=-25\)
c. \(2x-15=-47\)
\(2x=\left(-47\right)+15\)
\(x=\dfrac{\left(-32\right)}{2}\)
\(x=-16\)
d. \(\left(-5\right)^2-\left(5x-3\right)=43\)
\(25-\left(5x-3\right)=43\)
\(\left(5x-3\right)=25-43\)
\(5x=\left(-18\right)+3\)
\(x=\dfrac{\left(-15\right)}{5}=-3\)
e. \(\left|x-1\right|+\left(-5\right)=2\)
\(\left|x-1\right|=2-\left(-5\right)\)
\(\left|x-1\right|=7\)
\(\Leftrightarrow\left[{}\begin{matrix}x-1=7\\x-1=-7\end{matrix}\right.\Leftrightarrow}\left[{}\begin{matrix}x=8\\x=-6\end{matrix}\right.\)
f. \(\left|x+1\right|=4\)
\(\Leftrightarrow\left[{}\begin{matrix}x+1=4\\x+1=-4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-5\end{matrix}\right.\)
g. \(\left|x\right|=12\)
\(\Rightarrow x=\pm12\)
Câu h ko có x sao tìm
NN
7 tháng 1 2018
a) \(158-x=-12.\)
\(\Rightarrow x=158-\left(-12\right).\)
\(\Rightarrow x=158+12=170.\)
Vậy..........
b) \(37+x=12.\)
\(\Rightarrow x=12-37.\)
\(\Rightarrow x=-25.\)
Vậy..........
c) \(2x-15=-47.\)
\(\Rightarrow2x=-47+15.\)
\(\Rightarrow2x=-32.\)
\(\Rightarrow x=-\dfrac{32}{2}=-16.\)
Vậy..........
d) \(\left(-5\right)^2-\left(5x-3\right)=43.\)
\(\Rightarrow25-\left(5x-3\right)=43.\)
\(\Rightarrow5x-3=25-43.\)
\(\Rightarrow5x-3=-18.\)
\(\Rightarrow5x=-18+3.\)
\(\Rightarrow5x=-15.\)
\(\Rightarrow x=-\dfrac{15}{5}=3.\)
Vậy..........
e) \(\left|x-1\right|+\left(-5\right)=2.\)
\(\Rightarrow\left|x-1\right|=2-\left(-5\right).\)
\(\Rightarrow\left|x-1\right|=2+5.\)
\(\Rightarrow\left|x-1\right|=7.\)
\(\Leftrightarrow\left[{}\begin{matrix}x-1=7\\x-1=-7\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=8\\x=-6\end{matrix}\right..\)
Vậy..........
f) \(\left|x+1\right|=4\Leftrightarrow\left[{}\begin{matrix}x+1=4\\x+1=-4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-5\end{matrix}\right..\)
Vậy..........
g) \(\left|x\right|=12\Leftrightarrow\left[{}\begin{matrix}x=12\\x=-12\end{matrix}\right..\)
Vậy..........
28 tháng 6 2023
a: =>15/5*34/17<x<120/15
=>6<x<8
=>x=7
b; =>20/5*58/29<x<112/11
=>8<x<112/11
=>x=9 hoặc x=10
1 tháng 2 2017
a) -2x-x+17=34+x-25
<=> -2x-x-x=34-25-17
<=> -4x=-8
<=> x=2
b)17x+16x+37=2x+43
<=> 33x-2x=43-37
<=> 31x=6
<=>x=\(\frac{6}{31}\)
c) -2x-3x+51=34+2x-50
<=>-5x-2x=34-50-51
<=>-7x=-67
<=>x=\(\frac{67}{7}\)
d) [-2.(4x2-4x+1)- 1]=-106
<=> -8x2+8x-2-1=-106
<=>-8x2+8x=-103
a. x.3 + x.5 = 256
x.8 = 256
x = 32
b. 42.x - 37.x = 205
5.x = 205
x = 41
c. 34.x - 29.x = 155
5.x = 155
x = 31