杰克前几次数学检测的平均成绩是88分,这次要考100分,才能把平均成绩提高到91分,问这是他第几次考试?:W0g'p.q5r/S5v.C0H5u8R8E
算式:提示(s6u4}-\2],_(E;W/~7V)E9H/f+S:W0g'p.q5r/S5v.C0H5u8R8E
答:这是第,p6m1a9{-`次。:W0g'p.q5r/S5v.C0H5u8R8E