懒得动脑筋..(1)(m+2n)(2m-n)=?(2)-3²×(-3/2)的负二次方=?(3)?·(-2²y)=-3ax²y²已知x+y=3,xy=2,则x²+y²=?
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![懒得动脑筋..(1)(m+2n)(2m-n)=?(2)-3²×(-3/2)的负二次方=?(3)?·(-2²y)=-3ax²y²已知x+y=3,xy=2,则x²+y²=?](/uploads/image/z/12652996-4-6.jpg?t=%E6%87%92%E5%BE%97%E5%8A%A8%E8%84%91%E7%AD%8B..%EF%BC%881%EF%BC%89%EF%BC%88m%2B2n%EF%BC%89%EF%BC%882m-n%EF%BC%89%3D%3F%EF%BC%882%EF%BC%89-3%26%23178%3B%C3%97%EF%BC%88-3%2F2%EF%BC%89%E7%9A%84%E8%B4%9F%E4%BA%8C%E6%AC%A1%E6%96%B9%3D%3F%EF%BC%883%EF%BC%89%3F%C2%B7%EF%BC%88-2%26%23178%3By%EF%BC%89%3D-3ax%26%23178%3By%26%23178%3B%E5%B7%B2%E7%9F%A5x%2By%3D3%EF%BC%8Cxy%3D2%EF%BC%8C%E5%88%99x%26%23178%3B%2By%26%23178%3B%3D%EF%BC%9F)
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懒得动脑筋..(1)(m+2n)(2m-n)=?(2)-3²×(-3/2)的负二次方=?(3)?·(-2²y)=-3ax²y²已知x+y=3,xy=2,则x²+y²=?
懒得动脑筋..
(1)(m+2n)(2m-n)=?(2)-3²×(-3/2)的负二次方=?(3)?·(-2²y)=-3ax²y²
已知x+y=3,xy=2,则x²+y²=?
懒得动脑筋..(1)(m+2n)(2m-n)=?(2)-3²×(-3/2)的负二次方=?(3)?·(-2²y)=-3ax²y²已知x+y=3,xy=2,则x²+y²=?
(1)(m+2n)(2m-n)=3m²+3mn-2n²
(2)-3²×(-3/2)^(-2)=-4
(3)(3ax²y/2)·(-2²y)=-3ax²y²
∵x+y=3,
两边平方
x²+2xy+y²=9
∵xy=2
x²+y²+2×2=9
∴x²+y²=5
懒得动脑筋..(1)(m+2n)(2m-n)=?(2)-3²×(-3/2)的负二次方=?(3)?·(-2²y)=-3ax²y²已知x+y=3,xy=2,则x²+y²=?
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