怎么检查鱼缸有病菌:帮帮忙,谢谢
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|1-x|+|5+y|=0,则xy(x+y)=_______
20
20
|1-x|+|5+y|=0,则xy(x+y)=__20_____
怎么解的啊????
x=1,y=-5,xy(x+y)=20
20
20
|1-x|+|5+y|=0,则xy(x+y)=__20_____
怎么解的啊????
x=1,y=-5,xy(x+y)=20