4/1+28/1+70/1+130/1+208/1=?简算
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4/1+28/1+70/1+130/1+208/1=?简算
4/1+28/1+70/1+130/1+208/1=?简算
4/1+28/1+70/1+130/1+208/1=?简算
4/1+28/1+70/1+130/1+208/1
=4+28+70+130+208
=(4+28+208)+(70+130)
=240+200
=440
4+(28+208)+70+130=