寒假新时空 五年级上册第28页
1400 196 270 480 10 0.13 165 4.5
1.08/5=0.21 18.45/1.5=12.3
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横式：18.45除以1.5=12.3竖式自己写吧！
寒假新时空 五年级上册第28页视频
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