一道填空题~一道填空题~
一道填空题~
6xy 7am 2n25 5
6xy 7a
m 2n
25 5
1.(6xy)^2-(7a)^22.m^2-(2n)^23.25;5
(6xy)²-(7a)²(m)²-(2n)²m四次方-25=(m²+5)(m²-5)
(6xy)²-(7a)²
(m)²-(2n)²
m四次方-25=(m²+5)(m²-5)