(x-12)-15=(20-7)-(18+x)
(x-12)-15=(20-7)-(18+x)
(x - 12) - 15 = (20 - 7) - (18 + x)
<=> x - 12 - 15 = (20 - 7) - (18 + x)
<=> x - 27 = 20 - 7 - (18 + x)
<=> x - 27 = -x - 5
<=> x = -x - 5 + 27
<=> x = -x + 22
<=> 2x = 22
=> x = 11
\(\left(x-12\right)-15=\left(20-7\right)-\left(18+x\right)\)
\(x-27=13-18-x\)
\(x-27=-5-x\)
\(2x=-5+27=22\)
\(x=11\)
x-12 - 15= 20-7-18-x
=> ( x - 12 - 15 ) - ( 20 - 7 - 18 - x ) = 0
x - 12 - 15 - 20 + 7 + 18 + x = 0
x - 12 - 15 - 20 + 7 + 18 + x = 0
2x - 12 - 15 - 20 + 7 + 18 = 0
2x = 0 - 18 - 7 +20 + 15 + 12
2x = 22
x = 22 : 2
x = 11
(x-12)-15=(20-7)-(18+x)
\(\left(x-12\right)-15=\left(20-7\right)-\left(18+x\right)\)
\(x-12-15=20-7-\left(18+x\right)\)
\(x-12-15=x-27\)
\(20-7-\left(18+x\right)=-\left(x+5\right)\)
\(x-27=-\left(x+5\right)\)
\(x-27=-x-5\)
\(2x=22\)
\(x=11\)
(x-12)-15=(20-27)-(18+x)
x-12-15=(-7)-18-x
x-(12+15)=(-7)+(-18)-x
x-27=-25-x
x+x=-25-(-27)
2x=-25+27
2x=2
x=2:2
x=1
Vậy x=1
\(\left(x-12\right)-15=\left(20-7\right)-\left(18+x\right)\)
\(\Leftrightarrow x-12-15=13-18-x\)
\(\Leftrightarrow x-27=-5-x\)\(\Leftrightarrow x+x=-5+27\)
\(\Leftrightarrow2x=22\)\(\Leftrightarrow x=11\)
Vậy \(x=11\)
( x-12) - 15 = ( 20- 7 ) - ( 18 +x)
x - 12 - 15 = 13 - 18 - x
x + x = 13 - 18 + 12 + 15
2x = 22
x = 22 : 2
x = 11
Bài này cần nắm quy tắc chuyển vế đổi dấu và phá ngoặc đổi dấu thôi em ^^
(x-12) -15 = (20-7) - (18 + x)
\(\Rightarrow x-12-15=20-7-18-x\)
\(\Rightarrow x-27=-5-x\)
\(\Rightarrow x+x=27-5\)
\(\Rightarrow2x=22\)
\(\Rightarrow x=11\)
vậy x=11
(x-12)-15=(20-7)-(18+x)
lay ong di qua lay ba di lai cho xin may tick
\(\left(x-12\right)-15=\left(20-7\right)-\left(18+x\right)\)
\(\Rightarrow x-12-15=13-18-x\)
\(\Rightarrow x-27=-5-x\)
\(\Rightarrow x+x=27-5\)
\(\Rightarrow2x=22\)
\(\Rightarrow x=\frac{22}{2}\)
\(\Rightarrow x=11\)
(x-12)-15=(20-7)-(18+x)
x-12-15=20-7-18-x
x-27 = -5-x
suy ra x-27+5+x=0
2x-25=0
x=0+25=25
k mình nha
(x-12)-15=(20-7)-(18+x)
x - 12 - 15 = 13 - 18 - x
x - 27 = -5 - x
x + x = -5 + 27
2x = 22
=> x = 22 : 2 = 11
a) ( x - 12 ) - 15 = ( 20 - 7 ) - ( 18 + x )
a) ( x - 12 ) - 15 = ( 20 - 7 ) - ( 18 + x )
x - 27 = 13 - 18 - x
x + x = 13 - 18 + 27
2x = 22
x= 22 : 2 =11
Giải:
\(\left(x-12\right)-15=\left(20-7\right)-\left(18+x\right)\)
\(x-27=13-18-x\)
\(x+x=13-18+27\)
\(2x=22\)
\(x=22:2\)
\(x=11\)