25(x+y)^2-16(x-y)^2因式分解帮忙....

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25(x+y)^2-16(x-y)^2因式分解帮忙....25(x+y)^2-16(x-y)^2因式分解帮忙....25(x+y)^2-16(x-y)^2因式分解帮忙....25(x+y)^2-16(

25(x+y)^2-16(x-y)^2因式分解帮忙....
25(x+y)^2-16(x-y)^2因式分解
帮忙....

25(x+y)^2-16(x-y)^2因式分解帮忙....
25(x+y)^2-16(x-y)^2
=[5(x+y)+4(x-y)][5(x+y)-4(x-y)]
=(9x+y)(x+9y)

25(x+y)^2-16(x-y)^2
=(5(x+y)+4(x-y))(5(x+y)-4(x-y))
=(9x+y)(x+9y)

25(x+y)^2-16(x-y)^2
=(5x+5y)^2-(4x-4y)^2
=(5x+5y+4x-4y)*(5x+5y-4x+4y)
=(9x+y)*(x+9y)

等于9X^2加上82XY加上9Y^2