a—3的绝对值+（b+1）的二次方=0
a-3=0,a=3
b+1=0,b=-1
2b—a+m/2的值比1/2b—a+m的值多1
2b—a+m/2-1/2b—a+m=1
-2-3+m/2+1/2-3+m=1
3m/2=17/2
m=17/3
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