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x-(17-8) = 5+(10-3x)
x-9=5+10-3x
x+3x=5+10+9
x+3x=24
4x=24
x=24/4
x=6
vậy x=6
3 + (-2) +x =5
(-2) +x = 5-3
(-2) +x =2
x =2 - (-2)
x= 4
Vậy x = 4
tk nhé
1,-12 + x = 5x - 20
-12 + 20 = 5x - x
8 = 4x
x = 2
2, 7x - 4 = 20 + 3x
7x - 3x = 20 + 4
4x = 24
x = 6
3 , 5x - 7 = -21 - 2x
5x + 2x = -21 + 7
7x = -14
x = -14 : 7 = -2
4 , x + 15 = 20 - 4x
x + 4x = 20 - 15
5x = 5
x = 5 : 5 = 1
5, 17 - x = 7 - 6x
-x + 6x = 7 - 17
5x = -10
x = -10 : 5 = -2
a) \(3x-10=2x+13\Leftrightarrow x=13+10=23\)
b) \(x+12=-5-x\Leftrightarrow2x=-17\Leftrightarrow x=-\frac{17}{2}\)
c) \(x+5=10-x\Leftrightarrow2x=5\Leftrightarrow x=\frac{5}{2}\)
d) \(6x+23=2x-12\Leftrightarrow4x=-35\Leftrightarrow x=-\frac{35}{4}\)
e) \(12-x=x+1\Leftrightarrow2x=11\Leftrightarrow x=\frac{11}{2}\)
f) \(14+4x=3x+20\Leftrightarrow x=20-14=6\)
g) \(2\left(x-1\right)+3\left(x-2\right)=x-4\Leftrightarrow2x-2+3x-6=x-4\)
\(\Leftrightarrow5x-8=x-4\Leftrightarrow4x=4\Leftrightarrow x=1\)
h ) \(3\left(4-x\right)-2\left(x-1\right)=x+20\Leftrightarrow12-3x-2x+2=x+20\)
\(\Leftrightarrow14-5x=x+20\Leftrightarrow6x=-6\Leftrightarrow x=-1\)
i ) \(4\left(2x+7\right)-3\left(3x-2\right)=24\Leftrightarrow8x+28-9x+6=24\)
\(\Leftrightarrow34-x=24\Leftrightarrow x=34-24=10\)
k) \(3\left(x-2\right)+2x=10\Leftrightarrow3x-6+2x=5x-6=10\)
\(\Leftrightarrow5x=10+6=16\Leftrightarrow x=\frac{16}{5}\)
Tự KL cho các phần
a) -37 + 54+ (-70)+(- 163)+245
= [-37+ ( -163)] + (54+245) +(-70)
= - 200+ 299 + ( -70)
= 99 + ( -70)
= 29
Ko chắc lắm nha mk tính lại thấy sai mà ko biết sai ở đâu
a)(-37) + 54 + (-70) + (-163) + 246
-359+181+-123+350
=[(-359)+(-123)]+(181+350)
=-482+531
=49
c13-12+11+10+10-9+8-7-6+5-4+3+2-1
=(13-12+11)+(10+10)-(9+8-7)-(6+5-4+3)+(2-1)
=12+20+10+10+1
=32+10+10+1
=42+11
=53
x + 5 + x - 7 + x - 9 = x - 5 + x - 5
\(\Leftrightarrow\)x + x + x + 5 - 7 - 9 = x + x - 5 - 5
\(\Leftrightarrow\)3x + 5 - 16 = 2x - 10
\(\Leftrightarrow\)3x + 10 + 5 = 2x + 16
\(\Leftrightarrow\)3x + 15 = 2x + 16
\(\Leftrightarrow\)3x = 2x + 1
\(\Leftrightarrow\) 1 = 3x - 2x
\(\Leftrightarrow\) 1 = x
Vậy x = 1.
a) \(2x+5=\left(-10\right)-x\)
\(2x+x=-10-5\)
\(3x=-15\)
\(x=-15\div3\)
\(x=-5\)
\(5^2+125x=0\)
\(25+125x=0\)
\(125x=0-25\)
\(125x=-25\)
\(x=-25\div125\)
\(x=-\frac{1}{5}\)