7/13×(4/5÷7/39)简便计算

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7/13×(4/5÷7/39)简便计算
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7/13×(4/5÷7/39)简便计算
7/13×(4/5÷7/39)简便计算

7/13×(4/5÷7/39)简便计算
7/13×(4/5÷7/39)
=7/13×4/5×39/7
=7/13×39/7×4/5
=3×4/5
=12/5

7/13×(4/5÷7/39)
=7/13×4/5×39/7
=12/5

原式=7/13×4/5×39/7
=1/13×4/5×(3×13)
=4/5×3
=12/5
=2.4