90/(3.6-1.8) 3.6/0.4-1.2*53.4*7.8/3.9 0.36/[(6.1-4.6)*0.8]54/(3.94+6.86) (3.2+0.12)/0.80.175/0.25*4 0.175/0.25/0.4

问题描述:

90/(3.6-1.8) 3.6/0.4-1.2*5
3.4*7.8/3.9 0.36/[(6.1-4.6)*0.8]
54/(3.94+6.86) (3.2+0.12)/0.8
0.175/0.25*4 0.175/0.25/0.4

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