计算 3x【xy-2x(y-1/3x)】+3y(x2次-y2次)
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计算 3x【xy-2x(y-1/3x)】+3y(x2次-y2次)
计算 3x【xy-2x(y-1/3x)】+3y(x2次-y2次)
计算 3x【xy-2x(y-1/3x)】+3y(x2次-y2次)
你好!
原式= 3x [xy - 2xy - 2/3 x² ] + 3x²y - 3y³
= 3x²y - 6x²y - 2x³ + 3x²y - 3y²
= -2x³ - 3y³
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