计算5/4×9+5/9×14+5/14×19+.+5/34×39+5/39×44+5/44×49

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/06 05:48:53
计算5/4×9+5/9×14+5/14×19+.+5/34×39+5/39×44+5/44×49
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计算5/4×9+5/9×14+5/14×19+.+5/34×39+5/39×44+5/44×49
计算5/4×9+5/9×14+5/14×19+.+5/34×39+5/39×44+5/44×49

计算5/4×9+5/9×14+5/14×19+.+5/34×39+5/39×44+5/44×49
5/4×9+5/9×14+5/14×19+.+5/34×39+5/39×44+5/44×49
=1/4-1/9+1/9-1/14+1/14-1/19+.1/34-1/39+1/39-1/44+1/11-1/49
=1/4-1/49
=49/196-4/196
=45/196