计算:4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]急
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计算:4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]急计算:4xy²-3x²y
计算:4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]急
计算:4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]
急
计算:4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]急
4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]}
=4xy²-3x²y-3x²y+[2xy²-4x²y+2(x²y-2xy²)】
=4xy²-6x²y+2xy²-4x²y+2(x²y-2xy²)
=6xy²-10x²y+2x²y-4xy²
=2xy²-8x²y
计算:4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]急
计算x²-x/x²×x/1-x和x²-4y²/x²+2xy+y²÷x+2y/x²+xy
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计算:3(2x²-3xy²)-2(2xy²-3x²y)
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3x²-y²=8x²+xy+y²=4
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已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² 已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² + xY- 2Y² =求x² - 4x Y+ Y² =
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