19/20+29/30+41/42+55/56+71/72= 简便方法做
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19/20+29/30+41/42+55/56+71/72= 简便方法做
![19/20+29/30+41/42+55/56+71/72= 简便方法做](/uploads/image/z/3359065-49-5.jpg?t=19%2F20%2B29%2F30%2B41%2F42%2B55%2F56%2B71%2F72%3D+%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E5%81%9A)
19/20+29/30+41/42+55/56+71/72
=1-1/20+1-1/30+1-1/42+1-1/56+1-1/72
=5-(1/20+1/30+1/42+1/56+1/72)
=5-(1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9)
=5-(1/4-1/9)
=5-5/36
=4又29/36
=1-1/20+1-1/30+1-1/42+1-1/56+1-1/72
=5-(1/20+1/30+1/42+1/56+1/72)
=5-(1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9)
=5-(1/4-1/9)
=5-5/36
=4又29/36
19/20+29/30+41/42+55/56+71/72= 简便方法做
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