课件22张PPT。10-2=811-3=813-5=814-6=815-7=816-8=817-9=810-2=811-3=812-4=812-4=813-5=814-6=815-7=816-8=817-9=814-5=914-6=814-7=714-8=614-9=514-9=514-8=614-7=714-6=814-5=910-8=211-8=312-8=413-8=514-8=615-8=716-8=817-8=917-8=916-8=815-8=714-8=614-8=613-8=512-8=411-8=310-8=210-511-612-713-814-910-611-712-813-910-711-812-910-811-910-910-211-312-413-514-615-716-817-910-311-412-513-614-715-816-910-411-513-714-815-912-610-111-212-313-414-516-715-618-917-810-？11-？12-？13-？14-？15-？16-？17-？18-？98765432115 - 6 = 913 - 8 = 513 - 6 = 711 - 8 = 315 - 7 = 8
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