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15问答网 > 小红前几次数学考试平均成绩是88分，这次要考100分，才能把数学平均成绩提高到91分，求这次是第几

小红前几次数学考试平均成绩是88分，这次要考100分，才能把数学平均成绩提高到91分，求这次是第几

2025-03-27 13:47:00

推荐回答（5个）

回答1：

设这是第n次考试
88（n-1)+100/2=91n
解得n=4

回答2：

解
设在此之前考了x次试
（88x+100）/（x+1）=91
88x+100=91x+91
3x=9
x=3
所以这次是第4次考试

回答3：

第四次

回答4：

(n-1)88+100
———————— =91
n
88n-88+100＝91n
12=3n
n=4

回答5：

第四次。

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