x - 3 = (88 + x + 85 + 90 + 80)÷5
5(x - 3) = 343 + x
5x - 15 = 343 + x
5x - x = 343 + 15
4x = 358
x = 358 ÷ 4
x = 89.5
答:数学成绩是 89.5 分.
英语85,科学90,体育80,其中数学成绩比五科平均分多3分,数学成绩是多少分?
英语85,科学90,体育80,其中数学成绩比五科平均分多3分,数学成绩是多少分?
数学人气:602 ℃时间:2019-10-28 05:01:25
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