85×(42+40)-87.1×40,
=85×82-3484,
=6970-3484,
=3486(分),
3486÷42=83(人);
答:平均成绩是83分.
某校六年级有两个班,上学期级数学平均成绩是85分.已知六(1)班40人,平均成绩为87.1分;六(2)班有42人,平均成绩是多少分?
某校六年级有两个班,上学期级数学平均成绩是85分.已知六(1)班40人,平均成绩为87.1分;六(2)班有42人,平均成绩是多少分?
数学人气:219 ℃时间:2020-03-29 18:40:53
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