4x^2-y^2=x^2+x+1/4=4a^7-a^5=3a(m-n)+2b(n-m)=4mx^2-8m^2x+4m^3=x^3y-xy^3=因式分解,2x-7-1/7x^2=x^4-16=(x-2y)^2-14(x-2y)+49=(x-y)^3+4(y-x)=(x1+x2)^2-4x1-x2=

4x^2-y^2=x^2+x+1/4=4a^7-a^5=3a(m-n)+2b(n-m)=4mx^2-8m^2x+4m^3=x^3y-xy^3=因式分解,2x-7-1/7x^2=x^4-16=(x-2y)^2-14(x-2y)+49=(x-y)^3+4(y-x)=(x1+x2)^2-4x1-x2=
4x^2-y^2=
x^2+x+1/4=
4a^7-a^5=
3a(m-n)+2b(n-m)=
4mx^2-8m^2x+4m^3=
x^3y-xy^3=
因式分解,
2x-7-1/7x^2=
x^4-16=
(x-2y)^2-14(x-2y)+49=
(x-y)^3+4(y-x)=
(x1+x2)^2-4x1-x2=

4x^2-y^2=x^2+x+1/4=4a^7-a^5=3a(m-n)+2b(n-m)=4mx^2-8m^2x+4m^3=x^3y-xy^3=因式分解,2x-7-1/7x^2=x^4-16=(x-2y)^2-14(x-2y)+49=(x-y)^3+4(y-x)=(x1+x2)^2-4x1-x2=
4x^2-y^2=(2x+y)(2x-y)
x^2+x+1/4=(x+1/2)^2
4a^7-a^5= a^5(2a+1)(2a-1)
3a(m-n)+2b(n-m)= (3a-2b)(m-n)
4mx^2-8m^2x+4m^3=4m(x-m)^2
x^3y-xy^3= xy(x+y)(x-y)
因式分解,
2x-7-1/7x^2=-(x^2-14x+49)/7=-(x-7)^2/7
x^4-16= (x^2+4)(x+2)(x-2)
(x-2y)^2-14(x-2y)+49= (x-2y-7)^2
(x-y)^3+4(y-x)=(x-y)(x-y+2)(x-y-2)
(x1+x2)^2-4x1x2=(x1-x2)^2