3/2-1/6+19/12-11/20+41/30-29/42+71/56 怎样用裂项解决,要过程.哥哥姐姐们,帮帮我吧!
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![3/2-1/6+19/12-11/20+41/30-29/42+71/56 怎样用裂项解决,要过程.哥哥姐姐们,帮帮我吧!](/uploads/image/z/14746245-69-5.jpg?t=3%2F2-1%2F6%2B19%2F12-11%2F20%2B41%2F30-29%2F42%2B71%2F56+%E6%80%8E%E6%A0%B7%E7%94%A8%E8%A3%82%E9%A1%B9%E8%A7%A3%E5%86%B3%2C%E8%A6%81%E8%BF%87%E7%A8%8B.%E5%93%A5%E5%93%A5%E5%A7%90%E5%A7%90%E4%BB%AC%2C%E5%B8%AE%E5%B8%AE%E6%88%91%E5%90%A7%21)
3/2-1/6+19/12-11/20+41/30-29/42+71/56 怎样用裂项解决,要过程.哥哥姐姐们,帮帮我吧!
3/2-1/6+19/12-11/20+41/30-29/42+71/56 怎样用裂项解决,要过程.
哥哥姐姐们,帮帮我吧!
3/2-1/6+19/12-11/20+41/30-29/42+71/56 怎样用裂项解决,要过程.哥哥姐姐们,帮帮我吧!
3/2-1/6+19/12-11/20+41/30-29/42+71/56
=1+1/2+1-1/2-1/3+1+1/3+1/4+1-1/4-1/5+1+1/5+1/6+1-1/6-1/7+1+1/7+1/8
=7+1/2-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8
=7+1/8
=57/8
3/2-1/6+19/12-11/20+41/30-29/42+71/56
=(1+1/2)-(3-2)/6+1+(3+4)/12-2/20-(4+5)/20+1+(5+6)/30-1+(6+7)/42+1+(7+8)/56
=1+1/2-1/2+1/3+1+1/3+1/4-1/10-1/4-1/5+1+1/5+1/6-1+1/6+1/7+1+1/7+1/8
=3+2/3...
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3/2-1/6+19/12-11/20+41/30-29/42+71/56
=(1+1/2)-(3-2)/6+1+(3+4)/12-2/20-(4+5)/20+1+(5+6)/30-1+(6+7)/42+1+(7+8)/56
=1+1/2-1/2+1/3+1+1/3+1/4-1/10-1/4-1/5+1+1/5+1/6-1+1/6+1/7+1+1/7+1/8
=3+2/3-1/10+1/3+2/7+1/8
=4-1/10+2/7+1/8
=4-28/280+80/280+35/280
=4又280分之87
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