当a=2,b=-2时,求代数式3a²b³-1/2a²b+b-(4a³b³-1/4a²b-b²)+(a³b³+1/4a²b-2b²-3)的值.甲同学做题时把a=2错抄成a=-2;乙同学没抄错题,并且计算也正确.但甲,乙两同学所得
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![当a=2,b=-2时,求代数式3a²b³-1/2a²b+b-(4a³b³-1/4a²b-b²)+(a³b³+1/4a²b-2b²-3)的值.甲同学做题时把a=2错抄成a=-2;乙同学没抄错题,并且计算也正确.但甲,乙两同学所得](/uploads/image/z/250271-71-1.jpg?t=%E5%BD%93a%3D2%2Cb%3D-2%E6%97%B6%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F3a%26%23178%3Bb%26%23179%3B-1%2F2a%26%23178%3Bb%2Bb-%284a%26%23179%3Bb%26%23179%3B-1%2F4a%26%23178%3Bb-b%26%23178%3B%29%2B%28a%26%23179%3Bb%26%23179%3B%2B1%2F4a%26%23178%3Bb-2b%26%23178%3B-3%29%E7%9A%84%E5%80%BC.%E7%94%B2%E5%90%8C%E5%AD%A6%E5%81%9A%E9%A2%98%E6%97%B6%E6%8A%8Aa%3D2%E9%94%99%E6%8A%84%E6%88%90a%3D-2%EF%BC%9B%E4%B9%99%E5%90%8C%E5%AD%A6%E6%B2%A1%E6%8A%84%E9%94%99%E9%A2%98%2C%E5%B9%B6%E4%B8%94%E8%AE%A1%E7%AE%97%E4%B9%9F%E6%AD%A3%E7%A1%AE.%E4%BD%86%E7%94%B2%2C%E4%B9%99%E4%B8%A4%E5%90%8C%E5%AD%A6%E6%89%80%E5%BE%97)
当a=2,b=-2时,求代数式3a²b³-1/2a²b+b-(4a³b³-1/4a²b-b²)+(a³b³+1/4a²b-2b²-3)的值.甲同学做题时把a=2错抄成a=-2;乙同学没抄错题,并且计算也正确.但甲,乙两同学所得
当a=2,b=-2时,求代数式3a²b³-1/2a²b+b-(4a³b³-1/4a²b-b²)+(a³b³+1/4a²b-2b²-3)的值.
甲同学做题时把a=2错抄成a=-2;乙同学没抄错题,并且计算也正确.但甲,乙两同学所得的结果却一样.这是怎么回事?
当a=2,b=-2时,求代数式3a²b³-1/2a²b+b-(4a³b³-1/4a²b-b²)+(a³b³+1/4a²b-2b²-3)的值.甲同学做题时把a=2错抄成a=-2;乙同学没抄错题,并且计算也正确.但甲,乙两同学所得
-2平方后还是正数 所以结果一样.(ps需要计算结果么-.-)