最新(1)它们一共吃了这个西瓜的几分之几教学讲义ppt.ppt

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1、(1)它们一共吃了这个西瓜的几分之几+28+38=2+38=()85(1)它们一共吃了这个西瓜的几分之几？（3）还剩下几分之几？-1-58=88-58=8-58=()()38把一个物体看成数量“1”，把它平均分成几份，就可以用几分之几来表示；反过来，当一个分数的分子分母相同时，它就等于“1”。同分母分数相加减时，分母不变，分子相加减。分数的分子分母相同时，这个分数等于“1”。我会计算：19+49=5957-27=371-15=4558+28=783434-=01-37=47310410?310+410=710练一练?2989-29=6989471-47

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