图1是某班学生外出乘车步行、骑车的人数统计图①根据图1求出该班有多少名学生？②若全年级有500人，根据图2给出的扇形统计图估计该年级步行人数．
口算+=﹣=+ =﹣= 1﹣= ﹣=．
+=+=﹣=﹣=﹣= 1﹣= 1﹣=+=﹣=
用你喜欢的方法计算下面各题．+﹣﹣+﹣﹣﹣（﹣）+﹣++++（﹣）﹣+﹣．
直接写得数． 1﹣=+=+= 1﹣﹣=+3=+=+=++=
计算下面各题．=========
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