解4x²-3=(2x)²-(√3)²=(2x-√3)(2x+√3）16(x+y)²-25(x-y)²=[4(x+y)]²-[5(x-y)]²=[4(x+y)+5(x-y)][4(x+y)-5(x-y)]=(4x+4y+5x-5y)(4x+4y-5x+5y)=(9x-y)(9y-x)以后记得追问,不用补...