2x^2+(-x^2+3xy+2y^2)-(x^2-xy+2y^2).其中x=1/2,y=3化简求值,求过程!谢谢!
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![2x^2+(-x^2+3xy+2y^2)-(x^2-xy+2y^2).其中x=1/2,y=3化简求值,求过程!谢谢!](/uploads/image/z/2540881-1-1.jpg?t=2x%5E2%2B%28-x%5E2%2B3xy%2B2y%5E2%29-%28x%5E2-xy%2B2y%5E2%29.%E5%85%B6%E4%B8%ADx%3D1%2F2%2Cy%3D3%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%2C%E6%B1%82%E8%BF%87%E7%A8%8B%21%E8%B0%A2%E8%B0%A2%21)
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2x^2+(-x^2+3xy+2y^2)-(x^2-xy+2y^2).其中x=1/2,y=3化简求值,求过程!谢谢!
2x^2+(-x^2+3xy+2y^2)-(x^2-xy+2y^2).其中x=1/2,y=3
化简求值,求过程!谢谢!
2x^2+(-x^2+3xy+2y^2)-(x^2-xy+2y^2).其中x=1/2,y=3化简求值,求过程!谢谢!
原式=2x²-x²+3xy+2y²-x²+xy-2y²
=4xy
=4×1/2×3
=6
额,虾米意思
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