(1)(3x+4y-1)(3x-4y+1)
=(3x)²-(4y-1)²
=9x²-16y²+8y-1
分解因式:
(1)6m(m+n)-4n(m+n)
=(m+n)(6m-4n)
=2(m+n)(3m-2n)
(2)(m^2+n^2)^2-4m^2n^2
=(m²+n²+2mn)(m²+n²-2mn)
=(m+n)²(m-n)²
解:(1)原式=9x²-(4y-1)²=9x²-16y²+8y-1
(2)原式=2(m+n)(3m-2n)
(3)原式=(m²+n²+2mn)(m²+n²-2mn)=(m+n)²(m-n)²