Phân tích thành nhân tử: (a - b)2 - ( b - a) . ( a + b)
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\(1,\\ a,=4\left(x-2\right)^2+y\left(x-2\right)=\left(4x-8+y\right)\left(x-2\right)\\ b,=3a^2\left(x-y\right)+ab\left(x-y\right)=a\left(3a+b\right)\left(x-y\right)\\ 2,\\ a,=\left(x-y\right)\left[x\left(x-y\right)^2-y-y^2\right]\\ =\left(x-y\right)\left(x^3-2x^2y+xy^2-y-y^2\right)\\ b,=2ax^2\left(x+3\right)+6a\left(x+3\right)\\ =2a\left(x^2+3\right)\left(x+3\right)\\ 3,\\ a,=xy\left(x-y\right)-3\left(x-y\right)=\left(xy-3\right)\left(x-y\right)\\ b,Sửa:3ax^2+3bx^2+ax+bx+5a+5b\\ =3x^2\left(a+b\right)+x\left(a+b\right)+5\left(a+b\right)\\ =\left(3x^2+x+5\right)\left(a+b\right)\\ 4,\\ A=\left(b+3\right)\left(a-b\right)\\ A=\left(1997+3\right)\left(2003-1997\right)=2000\cdot6=12000\\ 5,\\ a,\Leftrightarrow\left(x-2017\right)\left(8x-2\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=2017\\x=\dfrac{1}{4}\end{matrix}\right.\\ b,\Leftrightarrow\left(x-1\right)\left(x^2-16\right)=0\Leftrightarrow\left[{}\begin{matrix}x=1\\x=4\\x=-4\end{matrix}\right.\)
\(\left(a+b-a+b\right)\left(a+b+a-b\right)=2b\cdot2a=4ab\)
\(=\sqrt{\left(a+b\right)\left(a-b\right)}+\sqrt{a-b
}\)
\(=\sqrt{a-b}\cdot\sqrt{a+b}+\sqrt{a-b}\)
\(=\sqrt{a-b}\cdot\left(\sqrt{a+b}+1\right)\)
\(\left(a-b\right)^2-\left(b-a\right)\\ =\left(a-b\right)\left(a-b\right)+\left(a-b\right)\\ =\left(a-b\right)\left(a-b+1\right)\)
`HaNa☘D`
\(\left(a-b\right)^2-\left(b-a\right)\)
\(=\left(a-b\right)^2+\left(a-b\right)\)
\(=\left(a-b\right)\left(a-b+1\right)\)
(a+b)2(a-b)2-2(a+b)(a-b)
=(a+b)(a-b)(a+b)(a-b)-2(a+b)(a-b)
=(a+b)(a-b)[(a+b)(a-b)-2]
=(a+b)(a-b)(a2-b2-2)
Ta có :
\(\left(a-b\right)^2-\left(b-a\right)\left(a+b\right)\)
\(=\)\(\left(a-b\right)^2+\left(a-b\right)\left(a+b\right)\)
\(=\)\(\left(a-b\right)\left(a-b+a+b\right)\)
\(=\)\(\left(a-b\right)2a\)
\(=\)\(2a\left(a-b\right)\)
Chúc bạn học tốt ~