3x-54:(-6)=-63
10.(x-7)-8.(x+5)=3.(-8)+12
x-96=(443-x)-15
a) -2 (x+6)+6 (x-10)=8
b) ( x-12)-15=(20-7) - (18-x)
c)2(5+3x)+x=31
d) -x (x+7) ( x-4) =0
e) x-96 = (443 - x) - 15
a) -2 (x+6)+6 (x-10)=8
-2.x + (-2).6 + 6.x - 6.10 = 8
-2x + (-12) + 6x - 60 = 8
-2x + 6x + [60 + (-12)] = 8
4x + 48 = 8
4x = 8 - 48
4x = -40
x = -40 : 4
x = -10
vậy_____
b) ( x-12)-15=(20-7) - (18-x)
x - 12 - 15 = 13 - 18 + x
x - 27 = -5 + x
x - x = -5 + 27
0x = 22
x = 22 : 0
=> x ∈ ∅
c)2(5+3x)+x=31
2.5 + 2.3x + x = 31
10 + 6x + x = 31
6x + x = 31 - 10
7x = 21
x = 21 : 7
x = 3
vậy_____
d) -x (x+7) ( x-4) =0
=> -x = 0 hoặc x+ 7 = 0 hoặc x - 4 = 0
=> x = 0 hoặc x = 0 - 7 hoặc x = 0 + 4
=> x = 0 hoặc x = -7 hoặc x = 4
vậy_____
e) x-96 = (443 - x) - 15
x - 96 = 443 - x - 15
x - 96 = (443 - 15) - x
x - 96 = 428 - x
x + x = 428 + 96
2x = 524
x = 524 : 2
x = 262
vậy_____
tìm x
a, x-96=(443-x)-15
b , 7x(-x-10)=0
c. 17*(3x-6)*(2x-8)=0
tham khảo nek: https://olm.vn/hoi-dap/detail/9664557962.html
a) x - 96 = (433 - x) - 15
x - 96 = 433 - x - 15
2x = 433 - 15 + 96
2x = 514
x = 257
b) 7x (-x-10) = 0
\(\Leftrightarrow\orbr{\begin{cases}7x=0\\-x-10=0\end{cases}}\)\(\Leftrightarrow\orbr{\begin{cases}x=0\\x=-10\end{cases}}\)
c) 17 (3x - 6) (2x - 8) = 0
(3x - 6) (2x - 8) = 0
\(\Leftrightarrow\orbr{\begin{cases}3x-6=0\\2x-8=0\end{cases}}\)\(\Leftrightarrow\orbr{\begin{cases}3x=6\\2x=8\end{cases}}\)\(\Leftrightarrow\orbr{\begin{cases}x=2\\x=4\end{cases}}\)
1, 3/x-7/-12/4x+8/=3x-8
2, -5/x-7/+3/3-x/=12x-8
3, /x-7/ -/3x-5/=0
1.tìm x thuộc z, biết
a. x-96=(443-x)-15 b. (x-12)-15=(20-7)-(18+x)
c. x.(x-10)=0 d. 17.(3x-6).(2x-8)=0
e. -x.(x+7).(x-4)=0 f. |-x+1| . |x-2|=0
i(3x-7)+2.(5-2x)+5x=19 l. |2x-2|-3x+1=-2
a, x - 96 = (443 - x) - 15
<=>x - 96 = 443 - x - 15
<=>x + x = 443 - 15 + 96
<=>2x = 524
<=>x = 524 : 2
<=>x = 262
b, (x - 12) - 15 = (20 - 7) - (18 + x)
<=>x - 12 - 15 = 20 - 7 - 18 - x
<=>x + x = 20 - 7 - 18 + 12 + 15
<=>2x = 22
<=> x = 22 : 2
<=> x = 11
Tìm x yhuoocj Z biết:
a) x-96=(443-x)-15
b) (x-12)-15=(20-7)-(18+x)
c) 311-x+82=46+(x-21)
d) -(x-3+85)=(x+70-71)-5
e) (-x+821+534)=499+(x-84)
f) x+96=(443-x)
a) x - 96 = (443 - x) - 15
x - 96 = 443 - x - 15
x + x = 443 -15 + 96
2x = 524
x = 524 : 2
x = 262
b) (x -12) - 15 = (20 - 7) - (18 + x)
x - 12 - 15 = 20 - 7 - 18 - x
x + x = 20 - 7 - 18 + 12 + 15
2x = 22
x = 22 : 2
x = 11
c) 311 - x + 82 = 46 + (x - 21)
311 - x + 82 = 46 + x - 21
-x - x = 46 - 21 - 311 - 81
-2x = -367
x = -367 : (-2)
x = 183,5
d) -(x - 3 + 85) = (x + 70 - 71) - 5
-x + 3 - 85 = x + 70 - 71 - 5
-x - x = 70 - 71 - 5 - 3 + 85
-2x = 76
x = 76 : (-2)
x = -38
e,f làm tương tự
a) x - 96 = (443 - x) - 15
x - 96 = 443 - x - 15
x + x = 443 -15 + 96
2x = 524
x = 524 : 2
x = 262
b) (x -12) - 15 = (20 - 7) - (18 + x)
x - 12 - 15 = 20 - 7 - 18 - x
x + x = 20 - 7 - 18 + 12 + 15
2x = 22
x = 22 : 2
x = 11
c) 311 - x + 82 = 46 + (x - 21)
311 - x + 82 = 46 + x - 21
-x - x = 46 - 21 - 311 - 81
-2x = -367
x = -367 : (-2)
x = 183,5
d) -(x - 3 + 85) = (x + 70 - 71) - 5
-x + 3 - 85 = x + 70 - 71 - 5
-x - x = 70 - 71 - 5 - 3 + 85
-2x = 76
x = 76 : (-2)
x = -38
e,f làm tương tự
a) x - 96 = (443 - x) - 15
x - 96 = 443 - x - 15
x + x = 443 -15 + 96
2x = 524
x = 524 : 2
x = 262
b) (x -12) - 15 = (20 - 7) - (18 + x)
x - 12 - 15 = 20 - 7 - 18 - x
x + x = 20 - 7 - 18 + 12 + 15
2x = 22
x = 22 : 2
x = 11
c) 311 - x + 82 = 46 + (x - 21)
311 - x + 82 = 46 + x - 21
-x - x = 46 - 21 - 311 - 81
-2x = -367
x = -367 : (-2)
x = 183,5
d) -(x - 3 + 85) = (x + 70 - 71) - 5
-x + 3 - 85 = x + 70 - 71 - 5
-x - x = 70 - 71 - 5 - 3 + 85
-2x = 76
x = 76 : (-2)
x = -38
e,f làm tương tự
Tìm số nguyên x biết
5.(3x - 21 ) = 0 ; x - 96 = ( 443 - x ) - 15 ; (3 - x ) . ( x + 4 ) = 0
help me !!!!!!
caau 1 5.(3x-21)=0
3x-21=0
3x=21
x=7
câu2 x-90=443-x-15
x+x=443+90-15
2x=524
x=262
câu3 (3-x).(x+4)=0
=> 3- x=0 hoặc x+4=0=>x=4
x=3
Thực hiện phép chia:
1. (-3x3 + 5x2 - 9x + 15) : ( 3x + 5)
2. ( 5x4 + 9x3 - 2x2 - 4x - 8) : ( x-1)
3. ( 5x3 + 14x2 + 12x + 8 ) : (x + 2)
4. ( x4 - 2x3 + 2x -1 ) : ( x2 - 1)
5. ( 5x2 - 3x3 + 15 - 9x ) : ( 5 - 3x)
6. ( -x2 + 6x3 - 26x + 21) : ( 3 -2x )
1: Sửa đề: 3x-5
\(=\dfrac{-x^2\left(3x-5\right)-3\left(3x-5\right)}{3x-5}=-x^2-3\)
2: \(=\dfrac{5x^4-5x^3+14x^3-14x^2+12x^2-12x+8x-8}{x-1}\)
=5x^2+14x^2+12x+8
3: \(=\dfrac{5x^3+10x^2+4x^2+8x+4x+8}{x+2}=5x^2+4x+4\)
4: \(=\dfrac{\left(x^2-1\right)\left(x^2+1\right)-2x\left(x^2-1\right)}{x^2-1}=x^2+1-2x\)
5: \(=\dfrac{x^2\left(5-3x\right)+3\left(5-3x\right)}{5-3x}=x^2+3\)
Tìm x
11/8 : x - 2/5 + -1/6= -1/5
4/7. x-x. 1/3 + -16/21 = -2/3
-11/12.x + 15/2. ( x + -1/5) = 67/8
\(\dfrac{11}{8}:x-\dfrac{2}{5}+-\dfrac{1}{6}=-\dfrac{1}{5}\\ =>\dfrac{11}{8}:x-\dfrac{2}{5}=-\dfrac{1}{5}-\left(-\dfrac{1}{6}\right)\\ =>\dfrac{11}{8}:x-\dfrac{2}{5}=-\dfrac{1}{5}+\dfrac{1}{6}\\ =>\dfrac{11}{8}:x-\dfrac{2}{5}=-\dfrac{6}{30}+\dfrac{5}{30}\\ =>\dfrac{11}{8}:x-\dfrac{2}{5}=-\dfrac{1}{30}\\ =>\dfrac{11}{8}:x=-\dfrac{1}{30}+\dfrac{2}{5}\\ =>\dfrac{11}{8}:x=-\dfrac{1}{30}+\dfrac{12}{30}\\ =>\dfrac{11}{8}:x=\dfrac{11}{30}\\ =>x=\dfrac{11}{8}:\dfrac{11}{30}\\ =>x=\dfrac{11}{8}.\dfrac{30}{11}\\ =>x=\dfrac{30}{8}\\ =>x=\dfrac{15}{4}\\ \dfrac{4}{7}x-\dfrac{1}{3}x+\left(-\dfrac{16}{21}\right)=-\dfrac{2}{3}\\ =>\left(\dfrac{4}{7}-\dfrac{1}{3}\right)x=-\dfrac{2}{3}-\left(-\dfrac{16}{21}\right)\\ =>\left(\dfrac{12}{21}-\dfrac{7}{21}\right)x=-\dfrac{2}{3}+\dfrac{16}{21}\\ =>\dfrac{5}{21}x=-\dfrac{14}{21}+\dfrac{16}{21}\\ =>\dfrac{5}{21}x=\dfrac{2}{21}\\ =>x=\dfrac{2}{21}:\dfrac{5}{21}\)
\(=>x=\dfrac{2}{21}.\dfrac{21}{5}\\ =>x=\dfrac{2}{5}\\ -\dfrac{11}{12}x+\dfrac{15}{2}\left(x+-\dfrac{1}{5}\right)=\dfrac{67}{8}\\ =>-\dfrac{11}{12}x+\dfrac{15}{2}.x-\dfrac{1}{5}=\dfrac{67}{8}\\ =>\left(-\dfrac{11}{12}+\dfrac{15}{2}\right)x=\dfrac{67}{8}+\dfrac{1}{5}\\ =>\left(-\dfrac{11}{12}+\dfrac{90}{12}\right)x=\dfrac{335}{40}+\dfrac{8}{40}\\ =>\dfrac{79}{12}x=\dfrac{343}{40}\\ =>x=\dfrac{343}{40}:\dfrac{79}{12}\\ =>x=\dfrac{343}{40}.\dfrac{12}{79}\\ =>x=\dfrac{343.12}{40.79}\\ =>x=\dfrac{343.3}{10.79}\\ =>x=\dfrac{1029}{790}\)
Giải pt
a) 2x(x+5) -(x-3) ²=x²+6
b) 6(x-3) +(x-1) ²-(x+1) ²=2x
c) 2x-3(x-2) =x+6+(x+1)
d) (x+4) ²-(x+8) (x-8) =96
e) 5x-2/6+3-4x/2=2-x+7/3
f) 2x-1/2=2x+1/4-1-2x/8
Tìm x, biết
a)3x³-27x=0
b) 2x³-12x²+18x=0
Giải pt :
a) \(2x\left(x+5\right)-\left(x-3\right)^2=x^2+6\)
\(\Leftrightarrow2x^2+10x-x^2+6x-9-x^2-6=0\)
\(\Leftrightarrow16x-15=0\)
\(\Leftrightarrow x=\frac{15}{16}\)
b) \(6\left(x-3\right)+\left(x-1\right)^2-\left(x+1\right)^2=2x\)
\(\Leftrightarrow2x-18=2x\)
\(\Leftrightarrow-18=0\)( vô lí )
=> x thuộc rỗng
c)d) tương tự
e) \(\frac{5x-2}{6}+\frac{3-4x}{2}=2-\frac{x+7}{3}\)
\(\Leftrightarrow\frac{5x-2}{6}+\frac{9-12x}{6}=\frac{12}{6}-\frac{2x+14}{6}\)
\(\Leftrightarrow5x-2+9-12x=12-2x-14\)
\(\Leftrightarrow-5x+9=0\)
\(\Leftrightarrow x=\frac{9}{5}\)
f) \(\frac{2x-1}{2}=\frac{2x+1}{4}-\frac{1-2x}{8}\)
\(\Leftrightarrow\frac{4\left(2x-1\right)}{8}=\frac{2\left(2x+1\right)}{8}-\frac{1-2x}{8}\)
\(\Leftrightarrow8x-4=4x+2-1+2x\)
\(\Leftrightarrow2x-5=0\)
\(\Leftrightarrow x=\frac{5}{2}\)
Tìm x :
a) \(3x^3-27x=0\)
\(\Leftrightarrow3x\left(x^2-9\right)=0\)
\(\Leftrightarrow3x\left(x-3\right)\left(x+3\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}3x=0\\x-3=0\\x+3=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=3\\x=-3\end{matrix}\right.\)
b) \(2x^3-12x^2+18x=0\)
\(\Leftrightarrow2x\left(x^2-6x+9\right)=0\)
\(\Leftrightarrow2x\left(x-3\right)^2=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=3\end{matrix}\right.\)