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99×89用简便方法计算脱式计算

99×89用简便方法计算脱式计算 99×89 =(100-1)×89 =100×89-89 =8900-89 =8811. 请采纳,谢谢.

89×99+89 =89×(99+1) =89×100 =8900

98x89 =100x89-2x89 =8900-178 =8722

解: 321+543×89 =321+543×(90-1) =543×90-(543-321) =48870-222 =48648

78x12+89x78-78 =78x12+89x78-78x1 =78x(12+89-1) =78x(101-1) =78x100 =7800

89×101-89 =89×(101-1) =89×100 =8900

501-273-89等于139

see

①0.25×0.975×40=0.25×40×0.975=10×0.975=9.75;②0.89×4.8+0.89×5.2=0.89×(4.8+5.2)=0.89×10=8.9;③(8+0.8)×1.25=8×1.25+0.8×1.25=10+1=11;④10-0.38-0.62=10-(0.38+0.62)=10-1=9;⑤45.3×101-45.3=45.3×(101-1)=45.3×100=4530;⑥1.25×0.2...

52X89 =52X(90-1) =52X90-52 =4680-52 =4628

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