(88+90+92+85+89+90)÷6 = =
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(88+90+92+85+89+90)÷6==(88+90+92+85+89+90)÷6==(88+90+92+85+89+90)÷6==(88+90+92+85+89+90)÷6=[(88+92)+
(88+90+92+85+89+90)÷6 = =
(88+90+92+85+89+90)÷6 = =
(88+90+92+85+89+90)÷6 = =
(88+90+92+85+89+90)÷6
=[(88+92)+(90+90)+(85+89)]÷6
=(180+180+174)÷6
=180÷6+180÷6+174÷6
=30+30+29
=89
(88+90+92+85+89+90)÷6 = =
（89+90+88+90+85+96+90+87+90+88+88+90+88+86+87+88+86）÷20=?
94+88+90+92+89+93+85+94如何简便算
简便算法.1.9+99+999+9999 2.94=88+90+92+89+93+85+94
巧算89,91,93,87,88,92,85,93,90,94的平均数
89+91+90+92+88+87+93+92+84+96
88+95+92+89+86+91+90+88+92+90+86+92+87+89+91+93+88+94+91+87
求出下面两组数的中位数.①96 94 93 94 95 89 90 86 94 99②95 92 90 85 96 97 95 92 88 95
99-98+97-96+95-94+93-92+91-90+89-88+87-86+85-.+3-2+1巧算
94十88十90十92十89十93十85十94(简便计算,要用递等式!
89+97+92+95+90+94+88+96+87
88 89 90 91 92=()x()=()四年级
求91,89,88,90,92五个数的方差
87,87,91,93,89,90,92,88,90,94,93,90,89,90,92.求平均数?众数?中位数?
用简便方法计算:88+95+92+89+86+91+90+88+92+90+86+92+87+89+91+93+88+94+91+87
简便运算(要详细过程)：88+95+92+89+86+91+90+88+92+90+86+92+87+89+91+93+88+94+91+87
简便算法:88+95+92+89+86+91+90+88+92+90+86+92+87+89+91+93+88+94+91+87
89+91+90+92+88+87+93+92+87用简便算法怎么做