配方得:(x+2y)^2+(x+1/2)*2=0
∵(x+2y)^2≥0,(x+1/2)*2≥0
∴(x+2y)^2=(x+1/2)*2=0
剩下的就不用我说了吧
2x的平方+4xy+4y的平方+x+4分之1=0,求x+y的值
2x的平方+4xy+4y的平方+x+4分之1=0,求x+y的值
数学人气:149 ℃时间:2020-03-20 03:24:05
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