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\(9x^2+24xy+16y^2\)
\(=\left(3x\right)^2+2\cdot3x\cdot4y+\left(4y\right)^2\)
\(=\left(3x+4y\right)^2\)
\(8x^3+1=\left(2x\right)^3+1^3\)
\(=\left(2x+1\right)\left(4x^2+2x+1\right)\)
\(a^4-b^4=\left(a^2-b^2\right)\left(a^2+b^2\right)=\left(a-b\right)\left(a+b\right)\left(a^2+b^2\right)\)
\(\left(a^2+9\right)^2-36a^2\)
\(=\left(a^2+9-6a\right)\left(a^2+9+6a\right)\)
\(=\left(x-3\right)^2\left(x+3\right)^2\)
\(a,x^6-y^6=\left(x^3\right)^2-\left(y^3\right)^2=\left(x^3-y^3\right)\left(x^3+y^3\right).\)
\(=\left(x-y\right)\left(x^2+xy+y^2\right).\left(x+y\right)\left(x^2-xy+y^2\right)\)
\(b,9x^2+y^2+6xy=\left(3x\right)^2+2.3x.y+y^2=\left(3x+y\right)^2\)
\(c,6x-9-x^2=-\left(x^2-6x+9\right)=-\left(x^2-2.x.3+3^2\right)=-\left(x-3\right)^2\)
\(x^6-x^4-9x^3+9x^2\)
\(=x^6-x^5+x^5-x^4-9x^2\left(x-1\right)\)
\(=x^5\left(x-1\right)+x^4\left(x-1\right)-9x^2\left(x-1\right)\)
\(=\left(x-1\right)\left(x^5+x^4-9x^2\right)\)
\(x^6-x^4-9x^3+9x^2\)
\(=x^4.\left(x^2-1\right)-9x^2\left(x-1\right)\)
\(=x^4.\left(x-1\right)\left(x+1\right)-9x^2\left(x-1\right)\)
\(=\left(x-1\right)\left[x^4.\left(x+1\right)-9x^2\right]\)
Đề sai nhé .Sửu lại
\(x^2-4x^2y^2+4+4x\)
\(=\left(x^2+4x+4\right)-4x^2y^2\)
\(=\left(x+2\right)^2-\left(2xy\right)^2\)
\(=\left(x+2+2xy\right)\left(x+2-2xy\right)\)
\(a,4x^2-12xy+9y^2=\left(2x-3y\right)^2\)
\(b,x^2-9x+20=x^2-4x-5x+20\)
\(=x\left(x-4\right)-5\left(x-4\right)\)
\(=\left(x-4\right)\left(x-5\right)\)
\(c,x^2+7x+12=x^2+3x+4x+12\)
\(=x\left(x+3\right)+4\left(x+3\right)\)
\(=\left(x+3\right)\left(x+4\right)\)
a) Ta có: \(9x^4-16y^6\)
\(=\left(3x^2\right)^2-\left(4y^3\right)^2\)
\(=\left(3x^2-4y^3\right)\left(3x^2+4y^3\right)\)
b) Ta có: \(-49x^4+81y^2\)
\(=81y^2-49x^4\)
\(=\left(9y\right)^2-\left(7x^2\right)^2\)
\(=\left(9y-7x^2\right)\left(9y+7x^2\right)\)