新城小学三年级有四个班，其中一班有50人，二班比一班多5人，三、四两班的总人数比一班的2倍多3人。三年级平均每班有多少人？
口算题．×=×=×9=××0=+=×11= 5﹣﹣=×9×7=
口算×15=×2=×=×=×= 1×=×=×34=×=×=×=×=×=×=×=×24=×=×30= 28×=×=
直接写出得数×15=×2=×=×= 1×=×=×34=×=×=×=×=×=
计算． 1×4.8 2×3.5 2.3×1 2×0.63．
口算：×15=×2=×=×=×= 1×=×=×34=×=×=×=×=
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