计算4x^2+9y^2-6xy
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计算4x^2+9y^2-6xy
计算4x^2+9y^2-6xy
计算4x^2+9y^2-6xy
4x^2+9y^2-6xy=(2x-3y)^2
错了,无法计算啊
4x²+9y²-6xy
4x^2+9y^2-12xy
=(2x-3y)²
计算4x^2+9y^2-6xy
计算4x^2+9y^2-6xy
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