合并同类项 1/4x²y-3x²+3/4x²y+2x²
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合并同类项 1/4x²y-3x²+3/4x²y+2x²
合并同类项 1/4x²y-3x²+3/4x²y+2x²
合并同类项 1/4x²y-3x²+3/4x²y+2x²
x²y-x²
合并同类项 1/4x²y-3x²+3/4x²y+2x²
合并同类项 1/4x²y-3x²+3/4x²y+2x²
合并同类项 1/4x²y-3x²+3/4x²y+2x²
x²y-x²