5x + 6x +1 =56
6X + 1 = 13
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\(\Leftrightarrow3x\left(2x-5\right)+2x-5-6x^2+5x-1-13=0\\ \Leftrightarrow6x^2-15x+2x-5-6x^2+5x-1-13=0\\ \Leftrightarrow-8x-19=0\\ \Leftrightarrow-8x=19\\ \Leftrightarrow x=-\dfrac{19}{8}\)
⇔3x(2x−5)+2x−5−6x2+5x−1−13=0⇔6x2−15x+2x−5−6x2+5x−1−13=0⇔−8x−19=0⇔−8x=19⇔x=−198
\(\left(6x+1\right)^2+\left(6x-1\right)^2-2\left(1+6x\right)\left(6x-1\right)\)
\(=\left(6x+1\right)^2-2\left(6x+1\right)\left(6x-1\right)+\left(6x-1\right)^2\)
\(=\left(6x+1-6x+1\right)^2\)
\(=4\)
\(x\left(2x^2-3\right)-x^2\left(5x+1\right)+x^2\)
\(=2x^3-3x-5x^3-x^2+x^2\)
\(=\left(2x^3-5x^3\right)+\left(x^2-x^2\right)-3x\)
\(=-3x^3-3x\)
\(3x\left(x-2\right)-5x\left(1-x\right)-8\left(x^2-3\right)\)
\(=3x^2-6x-5x+5x^2-8x^2+24\)
\(=\left(3x^2+5x^2-8x^2\right)-\left(6x+5x\right)+24\)
\(=-11x+24\)
a) (6x+1)2 + (6x-1)2 - 2(1+6x)(6x-1)
= (6x+1)2 - 2(6x+1)(6x-1) + (6x-1)2
= [ (6x+1) - (6x-1) ]2 = 22 = 4
b) x(2x2 - 3) - x2(5x+1) + x2
= 2x3 - 3x -5x3 -x2 + x2
= -3x3 - 3x = -3x(x2 -1) = -3x(x-1)(x+1)
c) 3x(x-2) - 5x(1-x) - 8(x2 -3)
= 3x2 - 6x - 5x + 5x2 -8x2 + 24
= -11x +24
5x+6x+1=56
<=>5x+6x=56-1
<=>5x+6x=55
<=>x(5+6)=55
<=>x.11=55
<=>x=55:11
<=>x=5
Vậy x=...
6x+1=13
<=>6x=13-1
<=>6x=12
<=>x=12:6
<=>x=2
Vậy x=...
~hok tốt~
k mik nhé
\(5x+6x+1=56\Leftrightarrow5x+6x=56-1\Leftrightarrow5x+6x=55\)
\(\Leftrightarrow\left(5+6\right)x=55\Leftrightarrow11x=55\Leftrightarrow x=55:11\)
\(\Rightarrow x=5\)
\(6x+1=13\Leftrightarrow6x=13-1\Leftrightarrow6x=12\)
\(\Leftrightarrow x=12:6\)
\(\Leftrightarrow x=2\)