越快越好(1)(xy²+3)(xy²+3)-2x(-x+y)(2)(x+2)(x²+4)(x-2)(3)先化简,再求值(x²y²-4)(-x²y²-4)-4(xy-1/2)(xy-1/2)其中x=1,y=-2(4)(-x-2y)(x-2y)半小时内解决,
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![越快越好(1)(xy²+3)(xy²+3)-2x(-x+y)(2)(x+2)(x²+4)(x-2)(3)先化简,再求值(x²y²-4)(-x²y²-4)-4(xy-1/2)(xy-1/2)其中x=1,y=-2(4)(-x-2y)(x-2y)半小时内解决,](/uploads/image/z/3669725-29-5.jpg?t=%E8%B6%8A%E5%BF%AB%E8%B6%8A%E5%A5%BD%EF%BC%881%EF%BC%89%28xy%26sup2%3B%2B3%29%28xy%26sup2%3B%2B3%29-2x%28-x%2By%29%EF%BC%882%EF%BC%89%28x%2B2%29%28x%26sup2%3B%2B4%29%28x-2%29%EF%BC%883%EF%BC%89%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%28x%26sup2%3By%26sup2%3B-4%29%28-x%26sup2%3By%26sup2%3B-4%29-4%28xy-1%2F2%29%28xy-1%2F2%29%E5%85%B6%E4%B8%ADx%3D1%2Cy%3D-2%EF%BC%884%EF%BC%89%28-x-2y%29%28x-2y%29%E5%8D%8A%E5%B0%8F%E6%97%B6%E5%86%85%E8%A7%A3%E5%86%B3%2C)
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越快越好(1)(xy²+3)(xy²+3)-2x(-x+y)(2)(x+2)(x²+4)(x-2)(3)先化简,再求值(x²y²-4)(-x²y²-4)-4(xy-1/2)(xy-1/2)其中x=1,y=-2(4)(-x-2y)(x-2y)半小时内解决,
越快越好
(1)(xy²+3)(xy²+3)-2x(-x+y)
(2)(x+2)(x²+4)(x-2)
(3)先化简,再求值(x²y²-4)(-x²y²-4)-4(xy-1/2)(xy-1/2)其中x=1,y=-2
(4)(-x-2y)(x-2y)
半小时内解决,
越快越好(1)(xy²+3)(xy²+3)-2x(-x+y)(2)(x+2)(x²+4)(x-2)(3)先化简,再求值(x²y²-4)(-x²y²-4)-4(xy-1/2)(xy-1/2)其中x=1,y=-2(4)(-x-2y)(x-2y)半小时内解决,
1 x^2y^4+2x^2+6xy^-2xy+9
2 x^4-16
3 -x^4y^4-4x^2y^2+4xy+15 值-25
4 4y^2-x^2