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3,2*0,2 :0,4=1,6
56 : 3,5* 2=32
0,9* 0,5 :1,5 * 3 =0,9
0,003 *0,05*0,6*10≈0,0009
0,04*0,2*0,005*0,0012 *60≈0,00000288