\(20x^3-10x^2+5x-20x^3+10x^2-4x=0\)
\(\left(20x^3-20x^3\right)+\left(-10x^2+10x^2\right)+\left(5x-4x\right)=0\)
\(x=0\)
5x∙4x2-5x∙2x+5x∙1+-2x∙10x2--2x∙5x+-2x∙2=-36
20x3 - 10x2+ 5x + -20x3 - 10x2+ - 4x =-36
(20x3 -20x3)+(-10x2-10x2)+(5x-4x)=-36
x =-36
\(20x^3-10x^2+5x-\left(20x^3-10x^2-4x\right)=20x^3-10x^2+5x-20x^3+10x^2+4x=9x=-36\)
\(x=-4\)
5x(4x2 - 2x + 1) - 2x(10x2 - 5x + 2) = -36
5x.4x2 + 5x.(-2x) + 5x.1 + (-2x).10x2 + (-2x).(-5x) + (-2x).2 = -36
20x3 + (-10x2) + 5x + (-20x3) + 10x2 + (-4x) = -36
(20x3 - 20x3) + (-10x2 + 10x2) + (5x - 4x) = -36
x = -36
Vậy x = -36.
5x(4x2-2x+1)-2x(10x2-5x+2)=-36
20x3-10x2+5x-20x3+10x2-4x=-36
(20x3-20x3)+(-10x2+10x2)+(5x-4x)=-36
x=-36
vậy x=-36
5x(4x
2
−2x+1)−2x(10x
2
−5x+2)=−36
5
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.
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5
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.
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.
1
+
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5x.4x
2
+5x.(−2x)+5x.1+(−2x).10x
2
+(−2x).(−5x)+(−2x).2=−36
20
x
3
+
(
−
10
x
2
)
+
5
x
+
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−
20
x
3
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20x
3
+(−10x
2
)+5x+(−20x
3
)+10x
2
+(−4x)=−36
(
20
x
3
−
20
x
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+
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10
x
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x
2
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(20x
3
−20x
3
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2
+10x
2
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x
=
−
36
x=−36
Vậy
x
=
−
36
x=−36.