一道数学题
9(x+3y)^2 -25(x-3y)^2=[_______]^2-[_______]^2=______·(______)·(_______).
参考答案:9(x+3y)^2 -25(x-3y)^2=[3(x+3y)]^2-[5(x-3y)]^2=4·(x-3y)·(12y-x).
9(x+3y)^2 -25(x-3y)^2=[_______]^2-[_______]^2=______·(______)·(_______).
参考答案:9(x+3y)^2 -25(x-3y)^2=[3(x+3y)]^2-[5(x-3y)]^2=4·(x-3y)·(12y-x).