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\(A)9-25=\left(7-x\right)-\left(25+7\right)\)
\(\Rightarrow9-25=7-x-25-7\)
\(\Rightarrow x=7-25-7-9+25\)
\(\Rightarrow x=\left(7-7\right)+\left(25-25\right)-9\)
\(\Rightarrow x=0+0-9\)
\(x=-9\)
\(B)x-\left(17-x\right)=x-7\)
\(\Rightarrow x-17+x=x-7\)
\(\Rightarrow2x-17=x-7\)
\(\Rightarrow x=-7+17\)
\(x=10\)
b) |x-3|=7 - (-2)
|x-3| = 9
TH 1 : TH 2 :
x - 3 = 9 x - 3 = -9
x = 9 + 3 x = -9 + 3
x = 12 x = 6
c) (7-x)-(25+7)=-25
(7-x) = -25 + 25 - 7
(7-x) = - 7
x = -7 + 7
x = 0
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
a, x-(17-x)=x-7
x-17+x = x-7
(x+x) - 17 = x - 7
2x - 17 = x - 7
2x - x = -7 + 17
1x = 10
x = 10
vậy_____
b, 9-25 = (7-x)-25+7
-16 = 7-x - 25 + 7
-16 = 7-x - (25-7)
-16 = 7-x - 18
-16 + 18 = 7 - x
2 = 7- x
2 - 7 = x
-5 = x
vậy____
x - ( 17 - x ) = x - 7
x - 17 + x = x - 7
x + x - x = 17 - 7
x = 10
9 - 25 = ( 7 - x ) - 25 +7
-16 = 7 - x - 25 + 7
- 16 = 7 - 32 - x
- 16 = -25 - x
x = - 25 - ( - 16 )
x = -9
\(\left|x\right|-7=9\Rightarrow\left|x\right|=16\)
\(\Rightarrow x=\pm16\)
\(9-25=\left(7-x\right)-\left(25+7\right)\)
\(9-25=7-x-25-7\)(tính chất mở ngoặc đôie dấu)
\(9-25=-x-25\)
\(\Rightarrow\)\(9=-x\)
\(\Rightarrow x=-9\)
Vậy x = - 9
\(a.\)
\(\left|x\right|-7=9\)
\(\Rightarrow\left|x\right|=9+7=16\)
\(\Rightarrow\left[{}\begin{matrix}x=16\\x=-16\end{matrix}\right.\)
\(b.\)
\(9-25=\left(7-x\right)-\left(25+7\right)\)
\(\Leftrightarrow9-25=7-x-25-7\)
\(\Rightarrow-16=-x-25\)
\(\Rightarrow-x=-16+25=9\)
\(\Rightarrow x=-9\)
Trl :
Ko chắc
\(\left(7-x\right)-\left(25-7\right)=-25\)
\(\Rightarrow\left(7-x\right)-18=-25\)
\(\Rightarrow\left(7-x\right)=-25+18\)
\(\Rightarrow7-x=-7\)
\(\Rightarrow x=7-\left(-7\right)\)
\(\Rightarrow x=0\)
Trả lời:
\(a,\)\(-9-25=\left(7-x\right)-\left(-25+7\right)\)
\(\Leftrightarrow-34=7-x-\left(-18\right)\)
\(\Leftrightarrow-34=7-x+18\)
\(\Leftrightarrow-34=25-x\)
\(\Leftrightarrow x=59\)(Thỏa mãn \(x\inℤ\))
Vậy x = 59
\(b,\)\(x-\left(17-x\right)=x-7\)
\(\Leftrightarrow x-17+x=x-7\)
\(\Leftrightarrow2x-17=x-7\)
\(\Leftrightarrow x=10\)(Thỏa mãn\(x\inℤ\))
Vậy x = 10
Banh Bao Tong
DỄ THẾ CŨNG HỎI
[7-x]-[25+7]=-25
7-x-25-7=-25
[7-7]-x=-25+25
0-x=0
x=0
Vậy: x=0
K MÌNH NHÉ!
( 7 - x ) - ( 25 + 7 ) = - 25
( 7 - x ) - 32 = -25
( 7 - x ) = -25 + 32
( 7 - x ) = 7
x = 7 - 7
x = 0
( 7 - x ) - ( 25 + 7 ) = (- 25)
( 7 - x ) - 32 = -25
( 7 - x ) = -25 + 32
( 7 - x ) = 7
x = 7 - 7
x = 0