计算:1/6+1/12+1/20+1/30+1/42+1/56+1/72(提示:1/6=1/2X3,1/12=1/3X4,1/20=/14X5)上面提示最后一个打错了,下面是正确的计算:1/6+1/12+1/20+1/30+1/42+1/56+1/72(提示:1/6=1/2X3,1/12=1/3X4,1/20=1/4X5)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 17:15:08
![计算:1/6+1/12+1/20+1/30+1/42+1/56+1/72(提示:1/6=1/2X3,1/12=1/3X4,1/20=/14X5)上面提示最后一个打错了,下面是正确的计算:1/6+1/12+1/20+1/30+1/42+1/56+1/72(提示:1/6=1/2X3,1/12=1/3X4,1/20=1/4X5)](/uploads/image/z/5460244-52-4.jpg?t=%E8%AE%A1%E7%AE%97%3A1%2F6%2B1%2F12%2B1%2F20%2B1%2F30%2B1%2F42%2B1%2F56%2B1%2F72%28%E6%8F%90%E7%A4%BA%3A1%2F6%3D1%2F2X3%2C1%2F12%3D1%2F3X4%2C1%2F20%3D%2F14X5%29%E4%B8%8A%E9%9D%A2%E6%8F%90%E7%A4%BA%E6%9C%80%E5%90%8E%E4%B8%80%E4%B8%AA%E6%89%93%E9%94%99%E4%BA%86%EF%BC%8C%E4%B8%8B%E9%9D%A2%E6%98%AF%E6%AD%A3%E7%A1%AE%E7%9A%84%E8%AE%A1%E7%AE%97%3A1%2F6%2B1%2F12%2B1%2F20%2B1%2F30%2B1%2F42%2B1%2F56%2B1%2F72%28%E6%8F%90%E7%A4%BA%3A1%2F6%3D1%2F2X3%2C1%2F12%3D1%2F3X4%2C1%2F20%3D1%2F4X5%29)
计算:1/6+1/12+1/20+1/30+1/42+1/56+1/72(提示:1/6=1/2X3,1/12=1/3X4,1/20=/14X5)上面提示最后一个打错了,下面是正确的计算:1/6+1/12+1/20+1/30+1/42+1/56+1/72(提示:1/6=1/2X3,1/12=1/3X4,1/20=1/4X5)
计算:1/6+1/12+1/20+1/30+1/42+1/56+1/72(提示:1/6=1/2X3,1/12=1/3X4,1/20=/14X5)
上面提示最后一个打错了,下面是正确的
计算:
1/6+1/12+1/20+1/30+1/42+1/56+1/72(提示:1/6=1/2X3,1/12=1/3X4,1/20=1/4X5)
计算:1/6+1/12+1/20+1/30+1/42+1/56+1/72(提示:1/6=1/2X3,1/12=1/3X4,1/20=/14X5)上面提示最后一个打错了,下面是正确的计算:1/6+1/12+1/20+1/30+1/42+1/56+1/72(提示:1/6=1/2X3,1/12=1/3X4,1/20=1/4X5)
那你就拆开呀,这样前后可以约掉,
1/6+1/12+1/20+1/30+1/42+1/56+1/72
=(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)+(1/8-1/9)
=1/2-1/9
=7/18
原式=1/2*3+1/3*4+1/4*5+1/6*7+1/7*8+1/8*9
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9
=1/2-1/9
=7/18
1/6+1/12+1/20+1/30+1/42+1/56+1/72
1/6=1/2X3,1/12=1/3X4,1/20=1/4X5.1/30=1/5X6..1/42=1/6X7..1/56=1/7X8..1/72=1/8X9