下列程序的输出结果为（　）. main（　） {intm=7,n=4; floata=38.4,b=6.4,x; x=m/2+n*a/b+1/2; printf(%f\n,x); }

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【单选题】【消耗次数：1】

① 27.000000

② 27.500000

③ 28.000000

④ 28.500000

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