七上(-109/26)-(-431/104)-(+190/13)-(+163/52)简便运算
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七上(-109/26)-(-431/104)-(+190/13)-(+163/52)简便运算
七上(-109/26)-(-431/104)-(+190/13)-(+163/52)简便运算
七上(-109/26)-(-431/104)-(+190/13)-(+163/52)简便运算
原式=431/104-109/26-190/13-163/52
全部乘104
得
431-436-1520-326=-1821
再除以104
得
-1821/104