设这个班有男生x人,女生y人,
则由题目可得 75.5x+81y=78(x+y)
化简的 x/y=6/5
所以男、女数比为:6:5
某班在一次数学考试中,平均成绩是78分,男,女生各自的平均成绩分别是75.5和81分,这个班男,女人数比是
某班在一次数学考试中,平均成绩是78分,男,女生各自的平均成绩分别是75.5和81分,这个班男,女人数比是
求,好了给············$_$·················钱
求,好了给············$_$·················钱
其他人气:639 ℃时间:2019-08-29 06:16:14
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