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| (1)6.73×4.8+5.2×6.73 =(4.8+5.2)×6.73 =10×6.73 =67.3; (2)1.6×[(12-7.2)÷(0.84÷2.1)] =1.6×[4.8÷0.4] =1.6×12 =19.2; (3)81÷[(3.25+6.75)×0.09] =81÷[10×0.09] =81÷0.9 =90; (4)0.45×78.2+20.8×0.45+0.45 =0.45×78.2+20.8×0.45+0.45×1 =0.45×(78.2+20.8+1) =0.45×100 =45. |
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