(1)16.4+3.5+83.6+166.5 =(16.4+83.6)+(3.5+166.5) =100+170 =270 (2)×38.3+1.7× =×(38.3+1.7) =×40 =32 (3) =(1.37+1.63)+ =3+1 =4
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