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a)(3x-1)2+2(3x-1)(2x+1)2(2x+1)=48x^4+56x^3+21x^2-12x-1 cái này tra google
b)(x2+1)(x-3)-(x-3)(x2+3x+9)=(x2+1)(x-3)-(x-3)(x+3)2=(x-3)[(x2+1)-(x+3)2 ]
c)(2x+3)2+(2x+5)2-2(2x+3)(2x+5)=(2x+3)2+(2x+5)2-(2x+3)(2x+5)-(2x+3)(2x+5)=(2x+3)(2x+3-2x+5)+(2x+5)(2x+5-2x+3)
=8(2x+3)+8(2x+5)=8(2x+3+2x+5)
=8(4x+8)
d)(x-3)(x+3)-(x-3)2 =(x-3)(x+3)-(x-3)(x-3)=(x-3)(x+3-x-3)=0
e)(2x+1)2+2(4x2-1)+(2x-1)2 =(2x+1)2+2[(2x)2 -1]+(2x-1)2 =(2x+1)(2x+1+2x-1)+(2x-1)(2x+1+2x-1)=4x(2x+1)+4x(2x-1)
=4x(2x+1+2x-1)=16x2
f)(x2-1)(x+2)-(x-2)(x2+2x+4)= (x2-1)(x+2)-(x-2)(x+2)2 =(x2-1)(x+2)-(x2-22)(x+2)=(x+2)(x2-1-x2-22) mình đoán câu f khai triển ra thế này nhưng kq không giống nhau nên chắc bạn phải tự làm rồi
a ) \(\left(2x-3\right)^3-x\left(2x-1\right)^2\)
\(=\left(2x\right)^3-3.\left(2x\right)^2.3+3.2x.3^2-3^3-x.\left(2x\right)^2-2.2x.1+1^2\)
\(=8x^3-3.4x^2.3+3.2x.9-27-x.4x^2-2.2x.x+1\)
\(=8x^3-36x^2+54x-27-4x^3-4x^2+1\)
\(=4x^3-40x^2+54x-26\)
a ) (2x−3)^3−x(2x−1)^2
=(2x)^3−3.(2x)^2.3+3.2x.3^2−33^−x.(2x)^2−2.2x.1+1^2
=8x^3−3.4x^2.3+3.2x.9−27−x.4x^2−2.2x.x+1
=8x^3−36x^2+54x−27−4x^3−4x2+1
=4x^3−40x^2+54x−26
a: \(=4x^2+20x+25+4x^2-20x+25-\left(4x^2-1\right)\)
\(=8x^2+50-4x^2+1=4x^2+51\)
b: \(=8a^3+12a^2b+6ab^2+b^3+8a^3-12a^2b+6ab^2-b^3-16a^3\)
\(=12ab^2\)
c: \(\left(2x-1\right)^3-\left(x-2\right)\left(x^2+2x+4\right)-7x^3-2x\)
\(=\left(2x-1\right)^3-x^3+8-7x^3-2x\)
\(=8x^3-12x^2+6x-1-8x^3-2x+8\)
\(=-12x^2+4x+7\)
d: \(\left(x+1\right)^2-\left(x-1\right)^2-3\left(x+1\right)\left(x-1\right)\)
\(=x^2+2x+1-\left(x^2-2x+1\right)-3\left(x^2-1\right)\)
\(=x^2+2x+1-x^2+2x-1-3x^2+3\)
\(=-3x^2+4x+3\)
\(a,\) \(3a^3.\left(x^2-1\right)^4:3a^3.\left(x^2-1\right)^3=15\)
\(\frac{3a^3.\left(x^2-1\right)^4}{3a^3.\left(x^2-1\right)^3}=15\\ x^2-1=15\\ x^2=16\\ x=4\)
\(b,\) \(x^3.\left(2x-1\right)^{m+2}:x^3.\left(2x-1\right)^{m-1}=3^5:3^2\\ \frac{x^3.\left(2x-1\right)^{m+2}}{x^3\left(2x-1\right)^{m-1}}=3^{5-2}\\ \left(2x-1\right)^3=3^3\)
\(2x-1=3\\ 2x=4\\ x=2\)
a/
\(\Leftrightarrow x-2x^2+2x^2-3x-4x+6=0\)
\(\Leftrightarrow-6x+6=0\)
\(\Leftrightarrow x=1\)
b/
\(\Leftrightarrow2x^2-4x-2x^2-6x=0\)
\(\Leftrightarrow-10x=0\)
\(\Leftrightarrow x=0\)
c/
\(\Leftrightarrow\left(2x+3\right)\left(2x+3+x-3\right)=0\)
\(\Leftrightarrow3x\left(2x+3\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-\frac{3}{2}\end{matrix}\right.\)
c/
\(\Leftrightarrow\left(x^2-2xy+y^2\right)+\left(9y^2+30y+25\right)=0\)
\(\Leftrightarrow\left(x-y\right)^2+\left(3y+5\right)^2=0\)
\(\Leftrightarrow\left\{{}\begin{matrix}x-y=0\\3x+5=0\end{matrix}\right.\)
\(\Leftrightarrow x=y=-\frac{5}{3}\)
d/
\(\Leftrightarrow4x^2-4x+1+4x^2+4x+1-2\left(4x^2-2x-2\right)+x=12\)
\(\Leftrightarrow8x^2+x+2-8x^2+4x+4=12\)
\(\Leftrightarrow5x=6\)
\(\Leftrightarrow x=\frac{6}{5}\)
b, \(x^3+2x^2+2x+1=\left(x^2+x+1\right)\left(x+1\right)\)
c, \(x^3-4x^2+12x-27=\left(x^2-x+9\right)\left(x-3\right)\)
d, \(x^4-2x^3+2x-1=\left(x-1\right)^3\left(x+1\right)\)
e, sai đề
a, \(\left(ab-1\right)^2+\left(a+b\right)^2=\left(a^2+1\right)\left(b^2+1\right)\)
b, \(x^3+2x^2+2x+1=\left(x+1\right)\left(x^2+x+1\right)\)
c, \(x^3-4x^2+12x-27=\left(x-3\right)\left(x^2-x+9\right)\)
d, \(x^4-2x^3+2x-1=\left(x-1\right)^3\left(x+1\right)\)
e, cho mình sửa đề xíu
\(x^4+2x^3+2x^2+2x+1=\left(x+1\right)^2\left(x^2+1\right)\)
2x^3-5x^2-x+1 2x+1 x^2-3x+1 2x^3+x^2 - -6x^2-x+1 -6x^2-3x - 2x+1 2x+1 - 0
(2\(x\) + 1)3
= (2\(x\))3 + 3.(2\(x\))2 + 3.2\(x\).12 + 13
= 8\(x^3\) + 12\(x^2\) + 6\(x\) + 1