十字相乘法:2X⁴-20X²Y²+18Y⁴
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十字相乘法:2X⁴-20X²Y²+18Y⁴
十字相乘法:2X⁴-20X²Y²+18Y⁴
十字相乘法:2X⁴-20X²Y²+18Y⁴
2X⁴-20X²Y²+18Y⁴
=2(x^2-9y^2)(x^2-y^2)
=2(x+3y)(x-3y)(x+y)(x-y)