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/x+2/=0\(\Rightarrow x+2=0\Rightarrow x=0-2=-2\)
/x-3/=7-(-2)=9\(\Rightarrow x=9+3=12ho\text{ặc}x=-9+3=-6\)
(7-x)-(25+7)=-25\(\Rightarrow\left(7-x\right)-32=-25\Rightarrow7-x=-25+32=7\Rightarrow x=0\)
/x-3/=/5/+/-7/=5+7=12\(\Rightarrow x=15ho\text{ặc}x=-9\)
/x-5/=/-7/=7\(\Rightarrow x=12ho\text{ặc}x=-2\)
4-(7-x)=x-(13-4)\(\Rightarrow x-3=x-9\Rightarrow x-x=-9+3\Rightarrow0=-6\)(vô lí)
Vậy không có x thoả mãn 4-(7-x)=x-(13-4)
|x+2|=0
Vì |0|=0,suy ra x+2=0
x=0-2
x=-2
Vậy x = -2
|x-3|=7-(-2)
|x-3|=7+2
|x-3|=9
Vì |9|=|-9|=9,suy ra x-3 thuộc{9;-9}
*x-3=9
x =9+3
x =12
*x-3=-9
x=-9+3
x=-6
Vậy x thuộc {12;-6}
tìm sood nguyên x biết
5 - x = 17 - (-5)
9-25 = (-7 - x ) - ( 25 - 7)
17 - { -x - [-x - (-x) ] } = -16
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a/ 5 - x = 17 - (-5)
5-x = 22
x= -17
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1) 9-25=(7-x)-(25+7)
(7-x)-(25+7)=9-25
(7-x)-(25+7)=-16
(7-x)-32=-16
7-x=-16+32
7-x=16
x=7-16
x=-9
2) (27-514) -(486-73)+x=7
(27-514) -(486-73)+x=7
-487-413+x=7
-1011+x=7
x=7-(-1011)
x=7+1011
x=1018
3) 25+5+37-25+6-29-x=37
25+5+37-25+6-29-x=37
67-25+6-29-x=37
42+6-29-x=37
48-29-x=37
19-x=37
x=19-37
x=-18
4) 14+(-12)+x =10-/-15/+ /-3/
14+(-12)+x =10-15+3
14+(-12)+x =-5+3
14+(-12)+x =-2
2+x=-2
x=-2-2
x=-4
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a, 11 - ( 15 + 11 ) = x - ( 25 - 9 )
11-15-11=x-25+9
-15=x-16
x=1
b, 2 - x = 17 - ( - 5 )
2-x=22
x=-20
c, x - 12 = ( - 9 ) - 15
x-12=-24
x=-12
d, 9 - 25 = ( 7 - x ) - ( 25 + 7 )
(7-x)-32=-16
7-x=16
x=-9
#H
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80 - 3 ( x - 7 ) = 20
<=> 3 ( x - 7 ) = 60
<=> x - 7 = 20
<=> x = 27
4 ( x - 1 ) + 5 = 25
<=> 4 ( x - 1 ) = 20
<=> x - 1 = 5
<=> x = 6
\(\text{Giải:}\)
\(80-3\left(x-7\right)=20\)
\(3\left(x-7\right)=80-20\)
\(3\left(x-7\right)=60\)
\(x-7=60:3\)
\(x-7=20\)
\(x=20+7\)
\(x=27\)
\(\text{Vậy x = 27}\)
\(4\left(x-1\right)+5=25\)
\(4\left(x-1\right)=25-5\)
\(4\left(x-1\right)=20\)
\(x-1=20:4\)
\(x-1=5\)
\(x=5+1\)
\(x=6\)
\(\text{Vậy x = 6}\)
\(\text{Học tốt!!!}\)
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a, 15-5(x+4)= -12-3 b,(7-x)-(25+7)= -25 15-5(x+4)= -15 7-x-32= -25 -5(x+4)=-15-15= -30 7-x= -25+32 x+4= -30 : (-5) = 6 7-x=7 x=6-4=2 x=7-7=0 tick cho mình nha
a, 15 - 5(x + 4) = -12 - 3
15 - 5(x + 4) = -15
5(x + 4) = 15 - (-15)
5(x + 4) = 30
x + 4 = 30 : 5
x + 4 = 6
x = 6 - 4
x = 2
b, (7 - x) - ( 25 + 7) = -25
(7 - x) - 32 = -25
7 - x = -25 + 32
7 - x = 7
x = 7 - 7
x = 0
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\(\left(3x-2\right):\frac{25}{7}=\frac{7}{5}\)
\(\Leftrightarrow3x-2=\frac{7}{5}.\frac{25}{7}\)
\(\Leftrightarrow3x-2=5\)
\(\Leftrightarrow3x=5+2\)
\(\Leftrightarrow3x=7\)
\(\Leftrightarrow x=7:3\)
\(\Leftrightarrow x=\frac{7}{3}\)
Vậy x = \(\frac{7}{3}\)
Bài làm:
\(\frac{x}{5}=-\frac{7}{25}\Leftrightarrow25x=-35\Leftrightarrow x=-\frac{7}{5}\)
Học tốt!!!!
Bài làm
\(\frac{x}{5}=\frac{-7}{25}\)
\(\Leftrightarrow25x=-35\)
\(\Leftrightarrow x=\frac{-7}{5}\)
Vậy \(x=\frac{-7}{25}\)