25m的平方-(4m-3n)的平方
=[5m-(4m-3n)][5m+(4m-3n)]
=(m+3n)(9m+3n)
=3(m+3n)(3m+n)
1、8(a+b)的平方-2
=2[4(a+b)^2-1]
=2[2(a+b)-1][2(a+b)+1]
=2(2a+2b-1)(2a+2b+1)
2、x的3次方-xy的平方
=x(x^2-y^2)
=x(x-y)(x+y)
25m的平方-(4m-3n)的平方
=[5m-(4m-3n)][5m+(4m-3n)]
=(m+3n)(9m+3n)
=3(m+3n)(3m+n)
1、8(a+b)的平方-2
=2[4(a+b)^2-1]
=2[2(a+b)-1][2(a+b)+1]
=2(2a+2b-1)(2a+2b+1)
2、x的3次方-xy的平方
=x(x^2-y^2)
=x(x-y)(x+y)