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4.28(7.4+2.6)=4.28*10=42.8 38.4(71.6-71.5)=38.4*0.1=3.84 9.18(123.5-122.5)=9.18*1=9.18 5.6(0.68+0.19-0.85)=5.3*0.02=0,106