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a,11-(15+21)=x-(25-9)
11-15-21=x-25+9
-x=-25+9-11+15+21
-x=9
x=-9
b,9-25=(7-x)-(25+7)
-16=7-x-32
x=7-32+16
x=-9
9 -25 = (7-x) - ( 25 +7)
- 16 = 7 -x - 32
x = 7 -32 +16
x =7 -16
x = - 9
9 - 25 = (7 - x) - ( 25 + 7)
-16 = 7 - x - 32
-16 = -25 - x
x = -25 - (-16)
x = -25 + 16
x = -9
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
Giải
9 – 25 = ( 7 – x ) – ( 25+7)
9 +( -25) = 7 – x – 25 – 7
-16 = 7 – x – 25 – 7
x = 7 – 7 – 25 +16
x = - 25 + 16
x = -9
\(9-25=\left(-7-x\right)-\left(25-7\right)\)
\(-7-x-18=-16\)
\(-x=-16+18+7\)
\(-x=9\)
\(x=-9\)
Vậy \(x=-9\).
9-25=(-7-x)-(25-7)
Ta có (-7-x)-(25-7)=9-25
(-7-x)-18=-16
-7-x=-16+18
-7-x=2
x=(-7)-2
x=-9
Vậy x=-9
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 - ( - 18 ) = -24
x + 18 = -24
x = -24 - 18
x = -6
b ) -x - 17 + 8 = 33 - 19
-x - 17 + 8 = 14
-x - 17 = 14 - 8
-x - 17 = 6
-x = -( 6 + 17 )
-x = - 23
c ) 15 - ( -4 + 7 ) = x - 14
15 + 4 + 7 = x - 14
27 = x - 14
x - 14 = 27
x = 27 + 14
x = 41
d ) 9 - 25 = ( 7 - x ) - ( 25 + 7 )
( 7 - x ) - 32 = -16
7 - x = -16 + 32
-7 - x = -16
x = -7 - ( - 16)
x = -7 + 16
x = 9
a)-16=7-x-25-7
-25-x=-16
x=-25-(-16)
x=-9
b)8x-x=10+4
7x=14
x=14:7
x=2
9 - 25 = (7 - x) - (25 + 7)
- 16 = 7 - x - 32
x = 7 - 32 + 16
x = - 9
9-25=(7-x)-(25+7)
-16=(7-x)-32
=>(7-x)=32-(-16)
7-x=48
x=7-48
x=-41