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957+792-(431+392)+39(8)(998+379+158)-(997+378+157)(9)9-0.9-0.09-0.009-0.0009(10)41.2×...
957+792-(431+392)+39
(8)(998+379+158)-(997+378+157)
(9)9-0.9-0.09-0.009-0.0009
(10)41.2×8.1+11×1.25+537×0.19 展开
(8)(998+379+158)-(997+378+157)
(9)9-0.9-0.09-0.009-0.0009
(10)41.2×8.1+11×1.25+537×0.19 展开
2个回答
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957+792-(431+392)+39
=957+792-431-392+39
=957+400-400-31+39
=957+8=965
(998+379+158)-(997+378+157)
=998-997+379-378+158-157
=1+1+1=3
9-0.9-0.09-0.009-0.0009
=9-1+0.1-0.1+0.01-0.01+0.001-0.001+0.0001
=8+0.0001=8.0001
41.2×8.1+11×1.25+537×0.19
=(42-0.8)*(8+0.1)+10*1.25+1.25+537*(0.2-0.01)
=42*8-6.4-0.08+4.8+12.5+1.25+107.4-5.37
=336-6.48+4.8+13.75+107.4-5.37
=450.1
=957+792-431-392+39
=957+400-400-31+39
=957+8=965
(998+379+158)-(997+378+157)
=998-997+379-378+158-157
=1+1+1=3
9-0.9-0.09-0.009-0.0009
=9-1+0.1-0.1+0.01-0.01+0.001-0.001+0.0001
=8+0.0001=8.0001
41.2×8.1+11×1.25+537×0.19
=(42-0.8)*(8+0.1)+10*1.25+1.25+537*(0.2-0.01)
=42*8-6.4-0.08+4.8+12.5+1.25+107.4-5.37
=336-6.48+4.8+13.75+107.4-5.37
=450.1
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