23-41.23+23又6/11-2-8.77-18又6/11很难?没人会?
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23-41.23+23又6/11-2-8.77-18又6/11很难?没人会?
23-41.23+23又6/11-2-8.77-18又6/11
很难?没人会?
23-41.23+23又6/11-2-8.77-18又6/11很难?没人会?
23-41.23+23又6/11-2-8.77-18又6/11
=23-2-(41.23+8.77)+(23又6/11-18又6/11)
=21-50+5又6/11
=5又6/11-29