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不知算不算簡便: 原式=3.2*9.4+6.8*0.6 =3.2*(10-0.6)+(10-3.2)*0.6 =32-3.2*0.6+10*0.6-3.2*0.6 =32+(10-3.2*2)*0.6 =32+3.6*0.6 =32+1.96 =33.96
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