=1+(3-2)+(5-4)+……+(99-98)
=1+1+1+……+1
=50
(1+3+5+.+97+99)-(2+4+6+.+96+98)等于神马?求算式.
(1+3+5+.+97+99)-(2+4+6+.+96+98)等于神马?求算式.
数学人气:869 ℃时间:2019-09-16 18:58:25
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