24)x^3+x^2y-4x-4y(nhóm)
25)3(x+4)-x^2-4x(nhóm)
26)x^3-3x^2+1-3x (nhóm)
29)x^2-xy+x-y(tách)
30)x^2-2x-15(mode)
32)2x^2+3x-5(mode)
34)x^3-x^2-x+1(nhóm)
35)x^2-7xy+10y^2 (nhóm)
phân tích đa thuc
áp dụng nhiều các nha cô
24)x^3+x^2y-4x-4y(nhóm)
25)3(x+4)-x^2-4x(nhóm)
26)x^3-3x^2+1-3x (nhóm)
29)x^2-xy+x-y(tách)
30)x^2-2x-15(mode)
32)2x^2+3x-5(mode)
34)x^3-x^2-x+1(nhóm)
35)x^2-7xy+10y^2 (nhóm)
phân tích đa thuc
áp dụng nhiều các nha cô
24) \(x^3+x^2y-4x-4y=x^2(x+y)-4(x+y)\)
\(=(x^2-4)(x+y)=(x-2)(x+2)(x+y)\)
25) \(3(x+4)-x^2-4x=3(x+4)+x(x+4)=(x+4)(x+3)\)
26) \(x^3-3x^2+1-3x=(x^3+1)-(3x^2+3x)\)
\(=(x+1)(x^2-x+1)-3x(x+1)=(x+1)(x^2-x+1-3x)\)
\(=(x+1)(x^2-4x+1)\)
29) \(x^2-xy+x-y=x(x-y)+(x-y)\)
\(=(x-y)(x+1)\)
30) \(x^2-2x-15=x^2-5x+3x-15\)
\(=x(x-5)-3(x-5)=(x-5)(x-3)\)
32) \(2x^2+3x-5=2x^2-2x+5x-5\)
\(=2x(x-1)+5(x-1)=(x-1)(2x+5)\)
34) \(x^3-x^2-x+1=x^2(x-1)-(x-1)\)
\(=(x-1)(x^2-1)=(x-1)(x+1)(x-1)=(x-1)^2(x+1)\)
35) \(x^2-7xy+10y^2=x^2-5xy-2xy+10y^2\)
\(=x(x-5y)-2y(x-5y)=(x-5y)(x-2y)\)