(x-y)^2+7(x+y)-11(x-y)^2-8(x+y),先化简.再求值
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(x-y)^2+7(x+y)-11(x-y)^2-8(x+y),先化简.再求值(x-y)^2+7(x+y)-11(x-y)^2-8(x+y),先化简.再求值(x-y)^2+7(x+y)-11(x-y)
(x-y)^2+7(x+y)-11(x-y)^2-8(x+y),先化简.再求值
(x-y)^2+7(x+y)-11(x-y)^2-8(x+y),先化简.再求值
(x-y)^2+7(x+y)-11(x-y)^2-8(x+y),先化简.再求值
(x-y)^2+7(x+y)-11(x-y)^2-8(x+y),
=-10(x-y)²-(x+y) 当x+y=-3,x-y=-1时
=-10*(-1)²-(-3)
=-10+3
=-7
=-10x^2-20xy-10y^2-x-y
=-10(x^2+2xy+y^2)-(x+y)
=-10(x+y)^2-(x+y)
不知道x，y的值是多少？
(x-y)^2+7(x+y)-11(x-y)^2-8(x+y)，
=-10(x-y)²-(x+y)
x,y都是几？
(x-y)^2+7(x+y)-11(x-y)^2-8(x+y),先化简.再求值
（x-y)^2+7(x+y)-11(x-y)^2-8(X+Y)的计算过程
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{(x,y) |x|+|y|
x>y?x:y
大括号x+y/2+x-y/3=11/6 4(x+y)-5(x-y)=7 快
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