=[(85+86+87+88+89+90)+(86+87+88+)+(3*88+4*90+96)]÷20
=(525+261+284+360+96)÷20
=(1050+350+360)÷20
=1710÷20
=171/2
(89+90+88+90+85+96+90+87+90+88+88+90+88+86+87+88+86)÷20=?
(89+90+88+90+85+96+90+87+90+88+88+90+88+86+87+88+86)÷20=?
数学人气:747 ℃时间:2019-08-18 22:00:47
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