已知丨x-3丨与(y+2)互为相反数,求5x-2xy+3y的值
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![已知丨x-3丨与(y+2)互为相反数,求5x-2xy+3y的值](/uploads/image/z/14772402-18-2.jpg?t=%E5%B7%B2%E7%9F%A5%E4%B8%A8x-3%E4%B8%A8%E4%B8%8E%EF%BC%88y%2B2%EF%BC%89%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2C%E6%B1%825x-2xy%2B3y%E7%9A%84%E5%80%BC)
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已知丨x-3丨与(y+2)互为相反数,求5x-2xy+3y的值
已知丨x-3丨与(y+2)互为相反数,求5x-2xy+3y的值
已知丨x-3丨与(y+2)互为相反数,求5x-2xy+3y的值
因为|X-3|≥0,(y+2)平方≥0,而且他们互为相反数,所以|X-3|=0,(y+2)平方=0,得x=3,y=-2 所以:5X-2XY+3Y=5*3-2*3*(-2)+3*(-2)=21