2右2/9—(2/9+5/12) 、(2/17+1/13)×17×39 递等式计算,谢谢
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2右2/9—(2/9+5/12)
=2又2/9-2/9-5/12
=2-5/12
=1又7/12
(2/17+1/13)×17×39
=2/17×17×39+1/13×17×39
=2×39+3×17
=78+51
=129
=2又2/9-2/9-5/12
=2-5/12
=1又7/12
(2/17+1/13)×17×39
=2/17×17×39+1/13×17×39
=2×39+3×17
=78+51
=129
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