因式分解-四分之一xy的立方+0.09xy

推荐回答

1. -9p^+4m^n^

=-(9p^-4m^n^)

=-(3p+2mn)(3p-2mn)

2. (2x+3y)^-(3x-2y)^

=(2x+3y-3x+2y)(2x+3y+3x-2y)

=(-x+5y)(5x-y)

3.-4分之一 xy的立方+0.09xy

=-xy(4分之一 xy^2-0.09)

=-xy[(1/2)xy+0.3)][(1/2)xy-0.3]

4.-4(m-3)^+49(m+2)^

=-[4(m-3)^-49(m+2)^]

=-[2(m-3)+7(m+2)](2(m-3)-7(m+2)]

=-(2m-6+7m+14)(2m-6-7m-14)

=-(9m+8)(-5m+20)

=5(9m+8)(m-4)

﹙¼XY﹚²＋００９XY

＝XY(¼XY+0.09)

-1/4xy³+0.09xy

=0.09xy-1/4xy³

=xy(0.09-1/4y²)

=xy(0.3+1/2y)(0.3-1/2y)