xx+yy+5/4 =2x+y 求x+y的值
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xx+yy+5/4=2x+y求x+y的值xx+yy+5/4=2x+y求x+y的值xx+yy+5/4=2x+y求x+y的值xx+yy+5/4=2x+y则(x-1)^2+(y-1/2)^2=0左边两项非负
xx+yy+5/4 =2x+y 求x+y的值
xx+yy+5/4 =2x+y 求x+y的值
xx+yy+5/4 =2x+y 求x+y的值
xx+yy+5/4 =2x+y
则(x-1)^2+(y-1/2)^2=0
左边两项非负,所以均是0
所以x=1,y=1/2
x+y=3/2
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