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17x + 3. ( -16x – 37) = 2x + 43 - 4x
<=>17x-48x-111=-2x+43
<=>-29x=154
<=> \(x=-\frac{154}{29}\)
-3. (2x + 5) -16 < -4. (3 – 2x)
\(\Leftrightarrow-6x-31< -12+8x.\)
\(\Leftrightarrow-14x< 19\Rightarrow x< -\frac{19}{14}\)
\(a,-12\left(x-5\right)+7\left(3-x\right)=5\)
\(-12x+60+21-7x=5\)
\(-12x-7x=5-60-21\)
\(-19x=-76\Leftrightarrow x=4\)
\(b,30\left(x+2\right)-6\left(x-5\right)-24x=100\)
\(30x+60-6x+30-24x=100\)
\(30x-6x-24x=100-60-30\)
\(0x=10\left(vl\right)\)
Vậy pt vô nghiệm
a,x+x2+x3+....+x9=459-9
<=>x(1+2+3+...+9)=450
<=>x45=450
<=>x=10
b ,thì tương tự nhé b
Câu 1:
a: =>-2x-x+17=34+x-25
=>-3x+17=x+9
=>-4x=-8
hay x=2
b: =>17x+16x+27=2x+43
=>33x+27=2x+43
=>31x=16
hay x=16/31
c: =>-2x-3x+51=34+2x-50
=>-5x+51=2x-16
=>-7x=-67
hay x=67/7
e: 3x-32>-5x+1
=>8x>33
hay x>33/8
a/ \(\left(x-23\right):14+25=42-1^{2002}\)
\(\Leftrightarrow\left(x-23\right):14+25=42-1\)
\(\Leftrightarrow\left(x-23\right):14+25=41\)
\(\Leftrightarrow\left(x-23\right):14=16\)
\(\Leftrightarrow x-23=192\)
\(\Leftrightarrow x=215\)
Vậy ....
b/ \(2^3.x+2002^0.x=995-15:3\)
\(\Leftrightarrow8.x+1.x=995-5\)
\(\Leftrightarrow x\left(8+1\right)=990\)
\(\Leftrightarrow9x=990\)
\(\Leftrightarrow x=110\)
Vậy ...
b/ \(x+2x+3x+.........+9x=459-3^2\)
\(\Leftrightarrow x\left(1+2+......+9\right)=459-9\)
\(\Leftrightarrow x.\dfrac{\left(9+1\right).\left[\left(9-1\right):1+1\right]}{2}=450\)
\(\Leftrightarrow x.45=450\)
\(\Leftrightarrow x=10\)
Vậy ...
