解了给100分.已知|x+1|与|2x+y|互为相反数,求多项式3(x-y)-5(x-y)²-3(x+y)+(y-x)²-4(x+y)²+3(y-x)的值
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![解了给100分.已知|x+1|与|2x+y|互为相反数,求多项式3(x-y)-5(x-y)²-3(x+y)+(y-x)²-4(x+y)²+3(y-x)的值](/uploads/image/z/2612875-67-5.jpg?t=%E8%A7%A3%E4%BA%86%E7%BB%99100%E5%88%86.%E5%B7%B2%E7%9F%A5%7Cx%2B1%7C%E4%B8%8E%7C2x%2By%7C%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2C%E6%B1%82%E5%A4%9A%E9%A1%B9%E5%BC%8F3%EF%BC%88x-y%EF%BC%89-5%EF%BC%88x-y%EF%BC%89%26sup2%3B-3%EF%BC%88x%2By%EF%BC%89%2B%EF%BC%88y-x%EF%BC%89%26sup2%3B-4%EF%BC%88x%2By%EF%BC%89%26sup2%3B%2B3%EF%BC%88y-x%EF%BC%89%E7%9A%84%E5%80%BC)
解了给100分.已知|x+1|与|2x+y|互为相反数,求多项式3(x-y)-5(x-y)²-3(x+y)+(y-x)²-4(x+y)²+3(y-x)的值
解了给100分.
已知|x+1|与|2x+y|互为相反数,求多项式3(x-y)-5(x-y)²-3(x+y)+(y-x)²-4(x+y)²+3(y-x)的值
解了给100分.已知|x+1|与|2x+y|互为相反数,求多项式3(x-y)-5(x-y)²-3(x+y)+(y-x)²-4(x+y)²+3(y-x)的值
|x+1|+|2x+y|=0,所以x+1=0,2x+y=0
x=-1,y=2
原式=3x-3y-5x^2+10xy-5y^2-3x-3y+x^2+y^2-2xy-4x^4-4y^2-8xy+3y-3x
=-8x^2-8y^2-3x-3y=-43