[(x+y)(x-y)²]³
3个回答
2012-05-15
展开全部
原式{(x+y)(x-y)²}³
={(x+y)(x-y)(x-y)}³
={(x²-y²)(x-y)}³
=(x²-y²)³(x-y)³或{(x²-y²)(x-y)}³
若要展开,设a=x²,b=y²
则按立方公式得原式=(a³-3a²b+3ab²-b³)(x³-3x²y+3xy²-y³)
去括号,合并同类项,要算吗?
={(x+y)(x-y)(x-y)}³
={(x²-y²)(x-y)}³
=(x²-y²)³(x-y)³或{(x²-y²)(x-y)}³
若要展开,设a=x²,b=y²
则按立方公式得原式=(a³-3a²b+3ab²-b³)(x³-3x²y+3xy²-y³)
去括号,合并同类项,要算吗?
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