絕對值大于等于0,相加等于0,若有一個大于0,則另一個小于0,不成立
所以兩個都等于0
所以x+y+1=0
xy+3=0
xy=-3
x+y=-1
兩邊平方
x^2+2xy+y^2=(-1)^2
x^2+y^2=1-2xy=7
xy^3+x^3y
=xy(x^2+y^2)
=-3*7
=-21
已知|x+y+1|+|xy+3|=0,求代數(shù)式xy^3+X^3y
已知|x+y+1|+|xy+3|=0,求代數(shù)式xy^3+X^3y
數(shù)學(xué)人氣：435 ℃時間：2020-03-26 01:38:15
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