用竖式计算．2.5+2.7= 41×24= 6.1﹣5.6=29×53= 37×51= 25×36=
食堂运进一批大米，吃掉吨，比剩下的多吨．这批大米原有多少吨？
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看“分数墙”列式计算
口算=+8+=﹣+=+= 3﹣﹣= 3﹣+=+= 1﹣﹣= 1++=
吨，比剩下的多
吨．这批大米原有多少吨？
=
=
=
=
=
=
=
=
=
=
+8+
=
﹣
+
=
+
= 3﹣
﹣
= 3﹣
+
+
﹣
= 1+
+
=
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