12/13×5/19+5/13×7/19简便算法? 5
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12/13×5/19+5/13×7/19
=12/19×5/13+5/13×7/19
=5/13×(12/19+7/19)
=5/13
=12/19×5/13+5/13×7/19
=5/13×(12/19+7/19)
=5/13
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12/13X5/19+5/13X7/19=5/13X12/19+5/13X7/19=5/13X(12/19+7/19)=5/13X1=5/13
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12/13×5/19
+5/13×7/19
=12/13×5/19
+7/13×5/19
=5/(13×19)
×(12+7)
=5×19/(13×19)
=5/13
+5/13×7/19
=12/13×5/19
+7/13×5/19
=5/(13×19)
×(12+7)
=5×19/(13×19)
=5/13
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2021-09-06
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12/13×5/19+5/13×7/19
=(12×5)/(13×19)+(5×7)/(13×19)
=〔(12×5)+(5×7)〕/(13×19)
=(12×5+5×7)/(13×19)
=〔5×(12+7)〕/(13×19)
=(5×19)/(13×19)
=5/13
=(12×5)/(13×19)+(5×7)/(13×19)
=〔(12×5)+(5×7)〕/(13×19)
=(12×5+5×7)/(13×19)
=〔5×(12+7)〕/(13×19)
=(5×19)/(13×19)
=5/13
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12/13×5/19 + 5/13×7/19
= (60+35)/(13×19) = 95/(13×19) = 5/13
= (60+35)/(13×19) = 95/(13×19) = 5/13
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