用递等式计算
31.8-2.6+15.28==16.83+8.7-21.56==9.8+(14.69-8.7)==86.7-(14.3-3.8)==...
31.8-2.6+15.28
=
=
16.83+8.7-21.56
=
=
9.8+(14.69-8.7)
=
=
86.7-(14.3-3.8)
=
= 展开
=
=
16.83+8.7-21.56
=
=
9.8+(14.69-8.7)
=
=
86.7-(14.3-3.8)
=
= 展开
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