1/2+1/6+1/12+1/20+1/30;1/2×3+1/3×4+1/4×5+1/5×6+1/6x7
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 05:56:02
![1/2+1/6+1/12+1/20+1/30;1/2×3+1/3×4+1/4×5+1/5×6+1/6x7](/uploads/image/z/12539302-70-2.jpg?t=1%2F2%2B1%2F6%2B1%2F12%2B1%2F20%2B1%2F30%3B1%2F2%C3%973%2B1%2F3%C3%974%2B1%2F4%C3%975%2B1%2F5%C3%976%2B1%2F6x7)
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1/2+1/6+1/12+1/20+1/30;1/2×3+1/3×4+1/4×5+1/5×6+1/6x7
1/2+1/6+1/12+1/20+1/30;1/2×3+1/3×4+1/4×5+1/5×6+1/6x7
1/2+1/6+1/12+1/20+1/30;1/2×3+1/3×4+1/4×5+1/5×6+1/6x7
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第二问等于7
5/6
1/2+1/6+1/12+1/20+1/30=1/2+1/2x3+1/3×4+1/4×5+1/5×6=1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6=5/6
5/6