若(x+1)^2+|y-2|=0,求3x^2-[5xy-(x^2y-3xy)+4x^2y-8xy]的值
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若(x+1)^2+|y-2|=0,求3x^2-[5xy-(x^2y-3xy)+4x^2y-8xy]的值若(x+1)^2+|y-2|=0,求3x^2-[5xy-(x^2y-3xy)+4x^2y-8xy]
若(x+1)^2+|y-2|=0,求3x^2-[5xy-(x^2y-3xy)+4x^2y-8xy]的值
若(x+1)^2+|y-2|=0,求3x^2-[5xy-(x^2y-3xy)+4x^2y-8xy]的值
若(x+1)^2+|y-2|=0,求3x^2-[5xy-(x^2y-3xy)+4x^2y-8xy]的值
将式子3x^2-[5xy-(x^2y-3xy)+4x^2y-8xy]化简得:3x^2-3x^2y.由等式(x+1)^2+|y-2|=0可知x=-1.y=2代入3x^2-3x^2y=-3即所求式子为-3
x=-1,y=2
x=-1 y=2
后面合并同类项 然后带入求值
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