七上(-21/4)-(+103/12)-(+12/7)-(+15/4)-(+2/7)简便运算
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七上(-21/4)-(+103/12)-(+12/7)-(+15/4)-(+2/7)简便运算
简便运算(要过程!)
简便运算(要过程!)
![七上(-21/4)-(+103/12)-(+12/7)-(+15/4)-(+2/7)简便运算](/uploads/image/z/19379083-67-3.jpg?t=%E4%B8%83%E4%B8%8A%28-21%2F4%29-%28%2B103%2F12%29-%28%2B12%2F7%29-%28%2B15%2F4%29-%28%2B2%2F7%29%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97)
(-21/4)-(+103/12)-(+12/7)-(+15/4)-(+2/7)
=(-21/4-15/4)-103/12-(12/7+2/7)
=-9-103/12-2
=-11-103/12
=235/12
=(-21/4-15/4)-103/12-(12/7+2/7)
=-9-103/12-2
=-11-103/12
=235/12
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