如何解方程x²- x=1?
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法一:x³-x
=x(x²-1)
=x(x+1)(x-1)
法二:x³-x
=x³-1-x+1
=(x³-1)-(x-1)
=(x-1)(x²+x+1)-(x-1)
=(x-1)(x²+x+1-1)
=(x-1)(x²+x)
=x(x-1)(x+1)
法三:x³-x
=x³+1-x-1
=(x³+1)-(x+1)
=(x+1)(x²-x+1)-(x+1)
=(x+1)(x²-x+1-1)
=(x+1)(x²-x)
=x(x-1)(x+1)
=x(x²-1)
=x(x+1)(x-1)
法二:x³-x
=x³-1-x+1
=(x³-1)-(x-1)
=(x-1)(x²+x+1)-(x-1)
=(x-1)(x²+x+1-1)
=(x-1)(x²+x)
=x(x-1)(x+1)
法三:x³-x
=x³+1-x-1
=(x³+1)-(x+1)
=(x+1)(x²-x+1)-(x+1)
=(x+1)(x²-x+1-1)
=(x+1)(x²-x)
=x(x-1)(x+1)
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