(113+115+117+···+191）-（112+114+116+···+190）=
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(113+115+117+···+191）-（112+114+116+···+190）=(113+115+117+···+191）-（112+114+116+···+190）=(113+115+117
(113+115+117+···+191）-（112+114+116+···+190）=
(113+115+117+···+191）-（112+114+116+···+190）=
(113+115+117+···+191）-（112+114+116+···+190）=
规律：113-112+1,115-114=1,……
所以原式=1+1+1+……+1=39
=(-112+113)+(-114+115)+(-116+117)……+（-190+191）=1+1+1+……+1=40
(113+115+117+···+191）-（112+114+116+···+190）= 39
去括号113+115+117+···+191-112-114-116-···-190
=113-112+（115-114）+···+（191-190）
=1+1+1+···+1
=39
(113+115+117+···+191）-（112+114+116+···+190）=
112+113+114+115+116+117+118+119+120...+190+191得数是几?
199+195+191+···+3等于?
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113+114+115+116+117=几
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