Tìm x, biết:
a) x.5 - x.2 = 30;
b) x. 34 - x.14 = 200;
c) x.16 - x.14 - x = 2.
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a)\(x-5=-1\)
⇔\(x=4\)
b)\(x+30=-4\)
⇔\(x=-34\)
c)\(x-\left(-24\right)=3\)
⇔\(x+24=3\)
⇔\(x=-21\)
e)\(\left(x+5\right)+\left(x-9\right)=x+2\)
⇔\(x+5+x-9-x-2=0\)
⇔\(x-6=0\)
⇔\(x=6\)
f)\(\left(27-x\right)+\left(15+x\right)=x-24\)
⇔\(27-x+15+x-x+24=0\)
⇔\(66-x=0\)
⇔\(x=66\)
\(a.x-5=-1\) \(b.x+30=-4\)
\(x=\left(-1\right)+5\) \(x=\left(-4\right)-30\)
\(x=4\) \(x=-34\)
\(c.x-\left(-24\right)=3\) \(e.\left(x+5\right)+\left(x-9\right)=x+2\)
\(x=3+\left(-24\right)\) \(x+5+x-9=x+2\)
\(x=-21\) \(2x-4=x+2\)
\(2x-x=2+4\)
\(x=6\)
\(f.\left(27-x\right)+\left(15+x\right)=x-24\)
\(27-x+15+x=x-24\)
\(27+15=x-24\)
\(42=x-24\)
\(x=24+42\)
\(x=66\)
a: Ta có: \(\left(5x+1\right)^2-\left(5x-3\right)\left(5x+3\right)=30\)
\(\Leftrightarrow25x^2+10x+1-25x^2+9=30\)
\(\Leftrightarrow10x=20\)
hay x=2
b: Ta có: \(\left(x-1\right)\left(x^2+x+1\right)-x\left(x+2\right)\left(x-2\right)=5\)
\(\Leftrightarrow x^3-1-x^3+4x=5\)
\(\Leftrightarrow4x=6\)
hay \(x=\dfrac{3}{2}\)
a,-4/7=x/21
-12/21 = x/21
x= -12
b,(x-3)/15=1/-5
x - 3 = -1/5 * 15
x - 3 = -3
x = 0
c,.(3x+8)/-12=-5/30
=> 3x + 8 = 2
=> 3x=-6
=>x=-2
a: x:(-9)=-54
=>\(x=\left(-54\right)\cdot\left(-9\right)\)
=>\(x=54\cdot9=486\)
b: \(x:\left(-12\right)=18\)
=>\(x=18\cdot\left(-12\right)=-216\)
c: \(x:\left(-5\right)=-19\)
=>\(x:5=19\)
=>\(x=19\cdot5=95\)
d: \(\left(x-28\right):\left(-12\right)=-5\)
=>\(x-28=\left(-12\right)\cdot\left(-5\right)=60\)
=>x=60+28=88
e: \(\left(x+15\right):\left(-28\right)=8\)
=>x+15=-28*8=-224
=>x=-224-15=-239
f: (x+30):(-45)=-4
=>\(x+30=\left(-45\right)\cdot\left(-4\right)=180\)
=>x=180-30
=>x=150
a) x : (-9) = -54
x= -54 . (-9)= 486
________
b) x : (-12) = 18
x= 18. (-12)= -216
_________
c) x : (-5) = -19
x= (-19). (-5)= 95
__________
d) (x - 28) : (-12) = -5
(x-28)= (-5). (-12)= 60
x= 60+28= 88
_______
e) (x + 15) : (-28) = 8
(x+15)= 8. (-28)= -224
x= -224 - 15 = - 239
__________
f) (x + 30) : (-45) = -4
(x+30)= -4. (-45)= 180
x= 180 - 30=150
1.
a.
11 + x : 5 = 13
x : 5 = 13 - 11
x : 5 = 2
x = 2 . 5
x = 10
a) x = 10.
b) x = 10.
c) x = 2.