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3又45/7+12又13/4-9又5/2+7又26/5等于多少啊,急,求解
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3又45/7+12又13/4-9又5/2+7又26/5
=3+7/45+12+4/13-9-2/5+7+5/26
=(3+12-9+7)+(4/13+5/26)+(7/45-2/5)
=13+(8/26+5/26)+(7/45-18/45)
=13+1/2-11/45
=13+(45/90-22/90)
=13+23/45
=13又(23/45)
=3+7/45+12+4/13-9-2/5+7+5/26
=(3+12-9+7)+(4/13+5/26)+(7/45-2/5)
=13+(8/26+5/26)+(7/45-18/45)
=13+1/2-11/45
=13+(45/90-22/90)
=13+23/45
=13又(23/45)
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