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\(1,\\ 1,=15\left(x+y\right)\\ 2,=4\left(2x-3y\right)\\ 3,=x\left(y-1\right)\\ 4,=2x\left(2x-3\right)\\ 2,\\ 1,=\left(x+y\right)\left(2-5a\right)\\ 2,=\left(x-5\right)\left(a^2-3\right)\\ 3,=\left(a-b\right)\left(4x+6xy\right)=2x\left(2+3y\right)\left(a-b\right)\\ 4,=\left(x-1\right)\left(3x+5\right)\\ 3,\\ A=13\left(87+12+1\right)=13\cdot100=1300\\ B=\left(x-3\right)\left(2x+y\right)=\left(13-3\right)\left(26+4\right)=10\cdot30=300\\ 4,\\ 1,\Rightarrow\left(x-5\right)\left(x-2\right)=0\Rightarrow\left[{}\begin{matrix}x=2\\x=5\end{matrix}\right.\\ 2,\Rightarrow\left(x-7\right)\left(x+2\right)=0\Rightarrow\left[{}\begin{matrix}x=7\\x=-2\end{matrix}\right.\\ 3,\Rightarrow\left(3x-1\right)\left(x-4\right)=0\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{3}\\x=4\end{matrix}\right.\\ 4,\Rightarrow\left(2x+3\right)\left(2x-1\right)=0\\ \Rightarrow\left[{}\begin{matrix}x=-\dfrac{3}{2}\\x=\dfrac{1}{2}\end{matrix}\right.\)
Sửa đề: 4x^2-y^2+8x+4
=4x^2+8x+4-y^2
=(2x+2)^2-y^2
=(2x+y+2)(2x-y+2)
\(4x^4-8x^3+3x^2-8x+4\)
\(=\left(4x^4-8x^3\right)+\left(3x^2-6x\right)-\left(2x-4\right)\)
\(=4x^3\left(x-2\right)+3x\left(x-2\right)-2\left(x-2\right)\)
\(=\left(x-2\right)\left(4x^3+3x-2\right)\)
x4 - 4x3 - 8x2 + 8x
= x(x3 - 4x2 - 8x + 8)
= x[x3 + 8 - 4x(x + 2)]
= x[(x + 2)(x2 - 2x + 4) - 4x(x + 2)]
= x(x + 2)(x2 - 6x + 4)
= x(x + 2)(x2 - 6x + 9 - 5)
= \(x\left(x+2\right)\left[\left(x-3\right)^2-5\right]=x\left(x+2\right)\left(x-3+\sqrt{5}\right)\left(x-3-\sqrt{5}\right)\)
\(x^4-4x^3-8x^2+8x\)
\(=x\left(x^3-4x^2-8x+8\right)\)
\(=x\left(x^3-6x^2+2x^2+4x-12x+8\right)\)
\(=x\left[\left(x^3-6x^2+4x\right)+\left(2x^2-12x+8\right)\right]\)
\(=x\left[x\left(x^2-6x+4\right)+2\left(x^2-6x+4\right)\right]\)
\(=x\left(x^2-6x+4\right)\left(x+2\right)\)
\(=x\left[\left(x-3\right)^2-\left(\sqrt{5}\right)^2\right]\left(x+2\right)\)
\(=x\left(x-3-\sqrt{5}\right)\left(x-3+\sqrt{5}\right)\left(x+2\right)\)
\(=x^2\left(x-1\right)-4\left(x-1\right)^2=\left(x-1\right)\left[x^2-4\left(x-1\right)\right]\\ =\left(x-1\right)\left(x^2-4x+4\right)=\left(x-1\right)\left(x-2\right)^2\)
mik bấm máy tính nó ra mỗi nghiệm là -2 thui bạn cứ tách từ từ nha bạn
a: \(3x^2-6xy+8x-16y\)
\(=\left(3x^2-6xy\right)+\left(8x-16y\right)\)
\(=3x\left(x-2y\right)+8\left(x-2y\right)\)
\(=\left(x-2y\right)\left(3x+8\right)\)
h: \(9y^2-4x^2+4x-1\)
\(=9y^2-\left(4x^2-4x+1\right)\)
\(=\left(3y\right)^2-\left(2x-1\right)^2\)
\(=\left(3y-2x+1\right)\left(3y+2x-1\right)\)
4x2 - 8x + 3
= 4x2 - 6x - 2x + 3
= ( 4x2 - 6x ) - ( 2x - 3 )
= 2x( 2x - 3 ) - ( 2x - 3 )
= ( 2x - 3 )( 2x - 1 )
\(4x^2-8x+3\)
\(=4x^2-2x-6x+3\)
\(=\left(4x^2-6x\right)-\left(2x-3\right)\)
\(=2x\left(2x-3\right)-\left(2x-3\right)\)
\(=\left(2x-1\right)\left(2x-3\right)\)
mình biết nội quy rồi nên đưng đăng nội quy
ai chơi bang bang 2 kết bạn với mình
mình có nick có 54k vàng đang góp mua pika
ai kết bạn mình cho
bạn làm theo cách này nhen
\(\left(4x+1\right)\left(4x-3\right)\left(2x-3\right)\left(8x+8\right)-130=\left(16x^2-8x-3\right)\left(16x-8x-24\right)-130\)
đặt \(16x^2-8x-3=y< =>y\left(y-21\right)-130=y^2-21y-130=y^2-2.y.\frac{21}{2}+\left(\frac{21}{2}\right)^2-\left(\frac{21}{2}\right)^2-130=\left(y-\frac{21}{2}\right)^2-240,25=\)
\(=\left(y-\frac{21}{2}\right)^2-15,5^2=\left(y-26\right)\left(y+12\right)\)
có chõ nào sai hay bạn không hiểu thì cũng đừng trách nhen
\(=4x^2-8x+4-3\)
\(=\left(2x-2-\sqrt{3}\right)\left(2x-2+\sqrt{3}\right)\)