m^2-8m+( )^2=( )^2(x^2+1)(x^2-1)-1515x^2-14xy-8y^2

问题描述:

m^2-8m+( )^2=( )^2
(x^2+1)(x^2-1)-15
15x^2-14xy-8y^2

m^2-8m+(4)^2=(m-4)^2
x^4-16
(3x-4y)(5x+2y)

1.括号内依次填
4
m-4
2.(x^2+1)(x^2-1)-15=(x^2+4)(x^2-4)
3.15x^2-14xy-8y^2=(3x-4y)(5x+2y)

m^2-8m+(4)^2=(m-4)^2
(x^2+1)(x^2-1)-15=x^4-16
15x^2-14xy-8y^2=(3x-4y)(5x+2y)