Tìm số nguyên x biết:
a) 7 + (-x) = (-5) - (-14)
b) 484 + x = (-632) + (-584)
c) 311 - x + 82= 46 + (x - 21 )
d) | x + 9 | = 12
1,tìm x
a,311-x+82=46=(x-21)
b,/3x-15/=0
c,/x+9/=12
giúp mk vs m.n
câu a=219
câu b = 5 nha có 2 trường hợp xảy ra
câu c tương tự câu b nha bn
a.484+x=(-632)+(-548)
b.(-x)+(-62)+(-46)=-14
c.25+(x-5)=-415-(15-415)
\(a)484+x=\left(-632\right)+\left(-548\right)\)
\(484+x=-1180\)
\(x=(-1180)-484\)
\(x=-1664\)
\(b)\left(-x\right)+\left(-62\right)+\left(-46\right)=-14\)
\(\left(-x\right)+\left(-62\right)=-14-\left(-46\right)\)
\(\left(-x\right)+\left(-62\right)=-14+46\)
\(\left(-x\right)+\left(-62\right)=32\)
\(\left(-x\right)=32-\left(-62\right)\)
\(\left(-x\right)=32+62\)
\(\left(-x\right)=94\)
\(\Rightarrow x=94\)
\(c)25+\left(x-5\right)=-415-\left(15-415\right)\)
\(25+\left(x-5\right)=-415-\left(-400\right)\)
\(25+\left(x-5\right)=-415+400\)
\(25+\left(x-5\right)=-15\)
\(x-5=-15-25\)
\(x-5=-40\)
\(x=-40+5\)
\(x=-35\)
thank you @lê thị thanh huyền
tìm x∈Z
a) x+7=5-14 b) -18-x= -8-13 c) 311-x+82=46+(x-21) d) |x-8|=7 f) 12-x=25-(-7) g) -20+x=11-(-12)
h) -x-15=(- 4) -( 27-20) i) 15-(x-7)=-21 k) |x-3|+8=7 l) (x-2) ×(x+15)=0 m) - 6x -(-7)=25 n) |x+9| -7= -12
\(a,x+7=5-14\)
\(x+7=-9\)
\(x=-9-7\)
\(x=-16\)
\(b,-18-x=-8-13\)
\(-18-x=-21\)
\(x=-18+21\)
\(x=3\)
\(c,311-x+82=46+\left(x-21\right)\)
\(393-x=46+x-21\)
\(393-x=25+x\)
\(x+x=393-25\)
\(2x=368\)
\(x=184\)
\(d,\left|x-8\right|=7\)
\(\Rightarrow\orbr{\begin{cases}x-8=7\\x-8=-7\end{cases}\Rightarrow\orbr{\begin{cases}x=15\\x=1\end{cases}}}\)
\(f,12-x=25-\left(-7\right)\)
\(12-x=25+7\)
\(12-x=32\)
\(x=12-32\)
\(x=-20\)
\(g,-20+x=11-\left(-12\right)\)
\(-20+x=11+12\)
\(-20+x=23\)
\(x=23+20\)
\(x=43\)
\(h,-x-15=\left(-4\right)-\left(27-20\right)\)
\(-x-15=-11\)
\(x=-15+11\)
\(x=-4\)
\(i,15-\left(x-7\right)=-21\)
\(15-x+7=-21\)
\(22-x=-21\)
\(x=22+21\)
\(x=43\)
\(k,\left|x-3\right|+8=7\)
\(\left|x-3\right|=7-8\)
\(\left|x-3\right|=-1\)
\(TH1:x-3\ge0\Leftrightarrow x\ge3\)
\(\Rightarrow x-3=-1\)
\(\Rightarrow x=2\)( loại )
\(TH2:x-3< 0\Leftrightarrow x< 3\)
\(\Rightarrow-x+3=-1\)
\(\Rightarrow x=4\)( loại )
=> ko có giá trị nào cả
\(l,\left(x-2\right)\times\left(x+15\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-2=0\\x+15=0\end{cases}\Rightarrow\orbr{\begin{cases}x=2\\x=-15\end{cases}}}\)
\(m,-6x-\left(-7\right)=25\)
\(-6x+7=25\)
\(-6x=25-7\)
\(-6x=18\)
\(x=-3\)
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 x ho mình với( mỗi caai 2 tích , trình bày đầy đủ)
a) 311-x+82=46+(x-21)
b) -(x-3+85)=(x+70-71)-5
c)(-x+821+534)=499+(x-84)
d)x+96=(443-x)-447
e)(x-12)-15)=(20-7)-(18+x)
Bài 2(2,5 điểm) Tìm số nguyên x biết:
a ) 3 - ( 17 - x ) = 289 - ( 36 + 289 )
b ) 25 + ( x-5 ) = - 415 - ( 15 - 415 )
c ) ( - x ) + ( - 62 ) + ( - 46 ) = - 14
d ) 484 + x = - 632 + ( - 548 )
e ) 17 - ( - x + ( - x - ( - x ) ) ) = -16
f ) x - (( - x + ( x + 3 ))) - (( x + 3 ) - ( x - 2 ) = 0
tìm x∈Z
a) x+7=5-14 b) -18-x= -8-13 c) 311-x+82=46+(x-21) d) |x-8|=7 f) 12-x=25-(-7) g) -20+x=11-(-12)
h) -x-15=(- 4) -( 27-20) i) 15-(x-7)=-21 k) |x-3|+8=7 l) (x-2) ×(x+15)=0 m) - 6x -(-7)=25 n) |x+9| -7= -12
Nếu Bạn Hỏi thì Hỏi từ từ 3-4 câu 1 lần thôi,chứ hỏi như này thì,.....
a,x+7=5−14
x+7=−9
x=−9−7
x=−16
b,−18−x=−8−13
−18−x=−21
x=−18+21
x=3
c,311−x+82=46+(x−21)
393−x=46+x−21
393−x=25+x
x+x=393−25
2x=368
x=184
d,|x−8|=7
⇒[
x−8=7 |
x−8=−7 |
⇒[
x=15 |
x=1 |
ƒ ,12−x=25−(−7)
12−x=25+7
12−x=32
x=12−32
x=−20
g,−20+x=11−(−12)
−20+x=11+12
−20+x=23
x=23+20
x=43
h,−x−15=(−4)−(27−20)
−x−15=−11
x=−15+11
x=−4
i,15−(x−7)=−21
15−x+7=−21
22−x=−21
x=22+21
x=43
k,|x−3|+8=7
|x−3|=7−8
|x−3|=−1
TH1:x−3≥0⇔x≥3
⇒x−3=−1
⇒x=2( loại )
TH2:x−3<0⇔x<3
⇒−x+3=−1
⇒x=4( loại )
=> ko có giá trị nào cả
l,(x−2)×(x+15)=0
⇒[
x−2=0 |
x+15=0 |
⇒[
x=2 |
x=−15 |
m,−6x−(−7)=25
−6x+7=25
−6x=25−7
−6x=18
x=−3
Tìm x
a,-18 - x = ( -8 ) + ( -13)
b,-x+(-32)+(-46)=(-84)
c,x-43=(57-x)-50
d,311-x + 82 = 46 + ( x - 21 )
e, 3x + 82 = -8
f, /x/ + 2 = 7
g, / 2x -15 / = 5
h, x = ( 2+x ) - x ( x+3 ) = 11
l, -4 ( 2x + 9 ) - ( -8x + 3 ) - ( x + 13 ) = 0
Giúp mk vs ah
Bài 1:Tìm x , biết :
a, (x-12) -15 = (20-7) - (18+x)
b, x- 96 = ( 443 - x) - 15
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) - 447
a, (x-12) -15 = (20-7) - (18+x)
<=> x - 12 - 15 = 13 - 18 - x
<=> 2x = 22
<=> x = 11
b, x- 96 = ( 443 - x) - 15
<=> x - 96 = 443 - x - 15
<=> 2x = 524
<=> x = 262
c, 311 - x + 82 = 46 + ( x- 21)
<=> 311 - x + 82 = 46 + x - 21
<=> 2x = 368
<=> x = 184
e, ( - x + 821 + 534 ) = 499 + ( x-84)
<=> - x + 821 + 534 = 499 + x - 84
<=> 2x = 940
<=> x = 470
f, x + 96 = ( 443 - x) - 447
<=> x + 96 = 443 - x - 447
<=> 2x = - 100
<=> x = - 50
d, - ( x - 3 + 85) = ( x + 70 - 71) -5
<=> - x + 3 - 85 = x + 70 - 71 - 5
<=> 2x = - 76
<=> x = - 38