数学之美为您解答
2/3（2x^2-3x+1）-2/5（4-3x-x^2）
=2/3{(2x-1)*(x-1)}+2/5(x^2+3x-4)
=2/3{(2x-1)*(x-1)}+2/5{(x+4)*(x-1)}
=2(x-1){(2x-1)/3+(x+4)/5}
=2/15(x-1)(13x+7)