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8 8、9 9的组成及加的组成及加减法减法18个 分成两堆,有几种分法?2871817加法加法减法减法3862826加法加法减法减法4853853加法加法减法减法5844加法加法减法减法681782683584485386287173544826817888=62826885833599个 分成两堆,有几种分法?10981918加法加法减法减法11972927加法加法减法减法12963936加法加法减法减法13954945加法加法减法减法14918927936945954963972981158514132679647835216你会吗?你会吗?你会吗?你会吗?177 + 1 =81 + 7 =8或或188 7 =18 1 =7或或196 + 2 =82 + 6 =8或或208 6 =28 2 =6或或215 + 3 =83 + 5 =8或或228 5 =38 3 =5或或234 + 4 =8248 4 =4258 + 1 =91 + 8 =9或或269 8 =19 1 =8或或277 + 2 =92 + 7 =或或9289 7 = 29 2 =或或7296 +3 = 93+ 6 =或或9309 6 = 39 3 =或或6315 +4 = 94+ 5 =或或9329 5 = 49 4 =或或53334