用简便方法计算:I1/11-1/12I+I1/12-1/13I+I1/14-1/13I
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![用简便方法计算:I1/11-1/12I+I1/12-1/13I+I1/14-1/13I](/uploads/image/z/14274359-71-9.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%EF%BC%9AI1%2F11-1%2F12I%2BI1%2F12-1%2F13I%2BI1%2F14-1%2F13I)
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用简便方法计算:I1/11-1/12I+I1/12-1/13I+I1/14-1/13I
用简便方法计算:I1/11-1/12I+I1/12-1/13I+I1/14-1/13I
用简便方法计算:I1/11-1/12I+I1/12-1/13I+I1/14-1/13I
1/11-1/12﹥0,1/12-1/13﹥0,1/14-1/13﹤0
| 1/11-1/12 |+| 1/12-1/13 |+| 1/14-1/13 |
=1/11-1/12+1/12-1/13-(1/14-1/13)
=1/11-1/13-1/14+1/13
=1/11-1/14
=3/154