tìm x:
a)15-(x-7)=-21
b)(17-x)-12=16
c)2x-35=15
d)3x+17=2
e)x-1=0
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Tìm số nguyên x, biết:
1) -16 + 23 + x = - 16
7+x=-16
x=-16-7
x=-23
2) 2x – 35 = 15
2x=15+35
2x=50
x=50:2
x=25
3) 3x + 17 = 12
3x=12-17
3x=-5
x=-5/3
4) (2x – 5) + 17 = 6
2x-5=6-17
2x-5=-11
2x=-11+5
2x=-6
x=-6:2
x=-3
5) 10 – 2(4 – 3x) = -4
2(4-3x)=10-(-4)
2(4-3x)=14
4-3x=14:2
4-3x=7
3x=4-7
3x=-3
x=-3:3
x=-1
6) - 12 + 3(-x + 7) = -18
3(-x+7)=-18-(-12)
3(x+7)=-6
x+7=-6:3
x+7=-2
x=-2-7
x=-9
1,-16+23+x=-16
=>23+x=-16-16
=>23+x=-32
=>x=-32-23
=>x=-55
2,2x-35=15
=>2x=15+35
=>2x=50
=>x=25
3,3x+17=12
=>3x=12-17
=>3x=-5
=>ko có x thỏa mãn
4,|x-1|=0
=>x-1=0
=>x=1
5,-13.|x|=-26
=>|x|=-26:-13
=>|x|=2
=>x=2 hoặc -2
1. -16+23+x=-16
23+x=(-16)-(-16)
23+x=(-16)+16
23+x=0
x=0-23
x=-23
2. 2x-35=15
2x=15+35
2x=50
x=50:2
x=25
3. 3x+17=12
3x=12-17
3x=-5
x=(-5):3
x=-5/3
4. /x-1/=0
/x/=0+1
/x/=1
=>x=1 hoặc x=-1
5. -13./x/=-26
/x/=(-26):(-13)
/x/=2
=>x=2 hoặc x=-2
1) 3x = 45 + 15 = 60
x = 60 : 3 = 20
2) 5x = 50 - 35 = 15
x = 15 : 5 = 3
3) (2x - 5) + 17 = 6
2x - 5 = 6 - 17
2x - 5 = -11
2x = -11 + 5
2x = -6
x = -6 : 2 = -3
4) 10 - 2(4 -3x) = -4
2(4 - 3x) = -4 - 10 = -14
4 - 3x = -14 : 2 = -7
3x = -7 - 4 = -18
x = -18 : 3 = -6
\(\left\{{}\begin{matrix}\left\{{}\begin{matrix}3x-15=45\Leftrightarrow3x=60\Leftrightarrow x=20\\35-5x=50\Leftrightarrow5x=-15\Leftrightarrow x=-3\end{matrix}\right.\\\left\{{}\begin{matrix}\left(2x-5\right)+17=6\Leftrightarrow2x+5=-11\Leftrightarrow2x=-16\Leftrightarrow x=-8\\10-2\left(4-3x\right)=-4\Leftrightarrow8-6x=14\Leftrightarrow6x=-6\Leftrightarrow x=-1\end{matrix}\right.\\\left\{{}\begin{matrix}-12+3\left(-x+7\right)=-18\Leftrightarrow-3x+21=-6\Leftrightarrow-3x=-27\Leftrightarrow x=9\\24:\left(3x-2\right)=-3\Leftrightarrow3x-2=-8\Leftrightarrow3x=-6\Leftrightarrow x=-2\end{matrix}\right.\\-45:5\left(-3-2x\right)=3\Leftrightarrow-15-10x=-15\Leftrightarrow10x=0\Leftrightarrow x=0\end{matrix}\right.\)
a)-16+23+x=-16
7+x=-16
x=-16-7
x=-23
b)2.x-35=15
2.x=15+35
2.x=50
x=50:2
x=25
c)3.x+17=12
3.x=12-17
3.x=-5
x=-5:3
x=-1,(6)
d)Ix-1I=0
IxI=0+1
IxI=1
=>x=1 hoặc x=-1
e)-13.IxI=-26
IxI=-26:(-13)
IxI=2
=>x=2 hoặc x=-2
a)x=-23
b)x=25
c)x=-5/3
d)x=1
e)x=2 hoac x=-2
tk minh nha
a)15-(x-7)=-21
=>x-7=15-(-21)
=>x-7=15+21
=>x-7=36
=>x=36+7
=>x=43
b)(17-x)-12=16
=>17-x=16+12
=>17-x=28
=>x=17-28
=>x=-11
c)2x-35=15
=>2x=15+35
=>2x=50
=>x=50:2
=>x=25
d)3x+17=2
=>3x=2-17
=>3x=-15
=>x-15:3
=>x=-5
e)x-1=0
x=0+1
x=1