用简便方法计算 78×3.6+78×7.4-7.8= 14.25-3.83-0.17
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/12 13:58:17
![用简便方法计算 78×3.6+78×7.4-7.8= 14.25-3.83-0.17](/uploads/image/z/55610-26-0.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97+78%C3%973%EF%BC%8E6%EF%BC%8B78%C3%977%EF%BC%8E4%EF%BC%8D7%EF%BC%8E8%EF%BC%9D+14%EF%BC%8E25%EF%BC%8D3%EF%BC%8E83%EF%BC%8D0%EF%BC%8E17)
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用简便方法计算 78×3.6+78×7.4-7.8= 14.25-3.83-0.17
用简便方法计算 78×3.6+78×7.4-7.8= 14.25-3.83-0.17
用简便方法计算 78×3.6+78×7.4-7.8= 14.25-3.83-0.17
7.8x10x3.6+7.8x10x7.4-7.8
=7.8x(36+74-1)
=7.8x(100+10+1)
=7800+78+7.8
=7878+7.8
=7885.8
14.25-3.83-0.17
=14.25-(3.83+0.17)
=14.25-4
=10.25