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1: =>x=8-35=-27
2: =>15-4+x=6
=>x+11=6
hay x=-5
3: =>-30+25-x=-1
=>x+5=1
hay x=-4
4: =>x-(-13)=-8
=>x+13=-8
hay x=-21
5: =>x-29-17+38=-9
=>x-8=-9
hay x=-1
a) 15 – ( 4 – x) = 6
=> 4 – x= 15 - 6
=> 4 – x= 9
=> x= 4 - 9
=> x= -5
Easy!
a) \(15-\left(4-x\right)=6\)
\(\Leftrightarrow4-x=15-6\)
\(\Leftrightarrow4-x=9\)
\(\Leftrightarrow x=4-9\)
\(\Leftrightarrow x=-5\)
Vậy \(x=-5\)
b) \(-30+\left(25-x\right)=-1\)
\(\Leftrightarrow\left(25-x\right)=-1-\left(-30\right)\)
\(\Leftrightarrow25-x=29\)
\(\Leftrightarrow x=25-29\)
\(\Leftrightarrow x=-4\)
c) \(x-\left(12-25\right)=-8\)
\(\Leftrightarrow x-\left(-13\right)=-8\)
\(\Leftrightarrow x=-8+-13\)
\(\Leftrightarrow x=-21\)
Vậy \(x=-21\)
d) \(\left(x-29\right)-\left(17-38\right)=-9\)
\(\Leftrightarrow\left(x-29\right)-\left(-21\right)=-9\)
\(\Leftrightarrow x-29=-9+\left(-21\right)\)
\(\Leftrightarrow x-29=-30\)
\(\Leftrightarrow x=-30+29\)
\(\Leftrightarrow x=-1\)
Vậy \(x=-1\)
a, 15 - ( 4 - x ) = 6
⇒ 15 - 4 + x = 6
⇒ 11+ x = 6
⇒ x = -5
c, x - ( 12 - 25 ) = -8
⇒ x + 13 = -8
⇒ x = -21
d, ( x - 29 ) - ( 17 - 38 ) = -9
⇒ x - 29 + 21 = -9
⇒ x - 8 = -9
⇒ x = -1
b, - 30 + ( 25 - x ) = -1
⇒ - 30 + 25 - x = -1
⇒ -5 - x = -1
⇒ x = -4
a, \(15-4+x=6\) ⇒ \(11-x=6\) ⇒ \(x=5\)
b, \(-30+25-x=-1\) ⇒ \(-5-x=-1\) ⇒ \(x=-4\)
c, \(x-12+25=-8\Rightarrow x+13=-8\) ⇒ \(x=-21\)
d, \(x-29-17+38=-9\Rightarrow x-8=-9\Rightarrow x=-1\)
a) x-(12-25)=-8
<=> x+13=-8
<=> x=-21
b) (x-29)-(17-38)=-9
<=> x-29+21=-9
<=> x-8=-9
<=> x=-1
a) Ta có: \(15-\left(4-x\right)=6\)
\(\Leftrightarrow15-4+x=6\)
\(\Leftrightarrow11+x=6\)
\(\Leftrightarrow x=-5\)
Vậy: x=-5
b) Ta có: \(-30+\left(25-x\right)=-1\)
\(\Leftrightarrow-30+25-x=-1\)
\(\Leftrightarrow-5-x=-1\)
\(\Leftrightarrow x=-5+1=-4\)
Vậy: x=-4
c) Ta có: \(x-\left(12-25\right)=-8\)
\(\Leftrightarrow x-12+25+8=0\)
\(\Leftrightarrow x+21=0\)
\(\Leftrightarrow x=-21\)
Vậy: x=-21
d) Ta có: \(\left(x-29\right)-\left(17-38\right)=-9\)
\(\Leftrightarrow x-29-17+38+9=0\)
\(\Leftrightarrow x+1=0\)
\(\Leftrightarrow x=-1\)
Vậy: x=-1
a.x-4=15-6 b.25-x=-30-(-1) c.x-(-13)=-8
x-4=9 25-x=-29 x+13=-8
x=9+4 x=25-(-29) x=-8-13
x=13 x=54 x=-21
d.x-29-(-21)=-9
x-29+21=-9
x-29=-9-21
x-29=-30
x=-30+29
x=-1
15-(4-x)=6
⇒15-4+x=6
⇒11+x=6
⇒x=-5
x-(12-25)=-8
⇒x+13=-8
⇒x=-21
(x-29)-(17-38)=-9
⇒x-29+21=-9
⇒x-8=-9
⇒x=-1
-30+(25-x)=-1
⇒-30+25-x=-1
⇒-5-x=-1
⇒x=-4